Shopify B2B Commerce for Auto Parts Distributors and Aftermarket Manufacturers

Uncap builds Shopify commerce for auto parts distributors, aftermarket manufacturers and specialty importers where all four hold at once: ACES and PIES fitment that a DIY buyer and a counter pro can both use, jobber and fleet tiers enforced at checkout, core charges handled as part of the order rather than after it, and an ERP connection that keeps pricing and availability honest.

Uncap is a Shopify Platinum Partner, on Shopify since 2013, with 380+ Shopify stores launched and 13+ years building on Shopify. Automotive is one of three verticals with a packaged Uncap Accelerator, built around Uncap Garage fitment and launching in as little as 45 days.

In most categories the catalog supports the sale. In auto parts the catalog is the sale. Get fitment wrong and you do not lose margin, you lose the order, the return shipping, the core credit, and eventually the account.

ACES and PIES exist because the industry agreed this was too important to improvise. But a standard is a data format, not a storefront. The distance between having clean ACES data and having a buyer land on the right part in two clicks is where these projects actually live, and it is the part nobody quotes accurately.

The professional buyer arrives with a part number or an application and wants the fastest possible path from knowing to ordering. The enthusiast arrives with a vehicle and wants to browse what fits it. The DIY buyer arrives with a symptom and needs the page to teach them something before they will commit.

Serve all three from one catalog and they interfere with each other. Split them across two storefronts and you now maintain fitment data twice, which is the failure mode that ends with a superseded part number live on one store and dead on the other.

Core charge logic has to be planned as ERP, order management or PIM work from the start, not added after launch. On an Uncap build it is configured during implementation, on top of the pricing engine and the ERP connection. The question to ask any partner is not whether they support it. It is whether they have built it before and what it cost.

"Jobber pricing" draws roughly 4,400 US searches a month with a cost per click near $22, which tells you both how many people are looking for it and how expensive it is to buy that attention. The reason it is expensive is that it is genuinely hard.

A jobber tier is not ten percent off. It is a tier that varies by brand line, that a fleet account overrides, that a warehouse distributor sits above, that changes when an account hits a volume threshold, and that has to be the number in the cart rather than a number applied later. When the storefront cannot hold that, the order goes back to the counter and the platform becomes a catalog with a phone number on it.

Part numbers change. A superseded number has to resolve to its replacement without the buyer knowing it happened, on both the trade and consumer side, from one source. Handled well it is invisible. Handled badly it produces the two worst outcomes in this business: a customer who orders a discontinued part, or a customer who is told a part does not exist when it does.

The automotive layer comes from two places. Shipped Uncap products cover fitment, diagram ordering, trade accounts, program quoting and the ERP connection. Core charges, supersession and competitor cross-reference are built during implementation. This page names which is which, so both halves land in the scope and the price.

Uncap Garage is built for exactly this. Shoppers build their garage by year, make, model and engine and keep it across visits, powered by ACES and PIES data, the auto care industry's vehicle fitment standards. Buyers select their year, make and model, and the catalog filters so they see only the parts that fit it.

Garage is for automotive parts and accessories merchants selling on Shopify. This is the page where that limitation is not a limitation.

The proof is published. Uncap built Kooks Headers and Exhaust, a 60 year performance automotive manufacturer, onto a single Shopify B2B and D2C store: Infor Visual ERP for real-time inventory, year, make, model and engine fitment search powered by a PDM Automotive PIM, and secure wholesale portals with custom pricing. The published results are 22% higher conversion and 38% lower total cost of ownership from consolidating the stack.

Their Sales and Marketing Director, Georgia Kryssing, described the starting point: "Before switching to Shopify, our old website held us back. We lacked analytics, marketing tools, and B2B capabilities, had no live inventory or search, and were stuck on a platform that was restrictive and hard to scale."

E3 Spark Plugs is the second published automotive build: a global B2B site with a year, make, model tool, a cross-reference application for finding replacement parts against competitor SKUs, Shopify Markets for international selling, and group pricing for dealers. Todd Arey, Founder and CEO: "Uncap Commerce is extremely efficient and does great work. They also provide great feedback and best practice advice!"

Scooterworks is the third, and the most interesting for parts-heavy catalogs. Alongside a custom year, make and model search, Uncap built shoppable diagrams so buyers can identify and purchase parts visually, with the ERP feeding inventory, pricing and product data, ShipperHQ for rating, and Shopify B2B catalogs and dealer resources for authorized sellers.

Three named automotive builds, two of them with attributed customer quotes, one with published metrics. That is a different conversation from a capabilities deck.

Performance brands carry one problem the rest of the aftermarket does not: emissions legality. A CARB Executive Order covers specific vehicles, not the part number, so a header can be legal on one engine and not the next. For header, exhaust, intake and tuning brands, the store has to hold EO status per application, gate California orders and control race-only lines alongside WD, jobber and installer pricing. See performance parts wholesale with CARB EO status on every fitment.

Wheel and tire distributors have a fitment problem this page only touches. A wheel fits on bolt pattern, center bore and offset rather than on a part number, and a package is only sellable when the wheel, tire, TPMS sensors and lug hardware all fit the same vehicle, with federal excise tax and state tire fees landing correctly on the invoice. That build has its own page: wheel and tire distributor ecommerce on Shopify.

Towing and trailer parts run on two fitment models: hitches and wiring fit the vehicle, while axles, hubs and bearings fit a spec of capacity, bolt pattern and spindle, with the spec matching built during implementation. See towing and trailer parts ecommerce. Truck and off-road accessories add cab style and bed length to year, make and model, and some ship as freight or go straight to a dealer's customer. Cab and bed filtering, freight pricing and dealer drop ship are each built during implementation, covered on truck and off-road accessories ecommerce.

For assemblies, kits and older applications, Uncap Diagrams lets a buyer click the part they need straight off the schematic and add it to cart, no part number required. Clickable hotspots map to live SKUs, assembly trees drill from assembly to sub-assembly to part, fitment-aware filtering narrows by model, year or assembly, and diagram import brings in existing schematics with their callouts mapped.

That import capability is the one worth pricing against alternatives. Legacy parts-book digitization is routinely treated as a separate specialist engagement. Here it is a documented feature of a shipped product, with a live implementation at Scooterworks.

Powersports parts run on the same fitment and pricing engine with a different identity problem. One rider owns a quad, a side-by-side and a sled; fitment turns on trim, seat count and track length as much as year; and the parts counter already works from the OEM exploded view. Diagram ordering, machine-level parts lookup and seasonal dealer stocking are covered on the page for powersports parts ecommerce on Shopify.

Neither core charge handling nor part number supersession is a published capability of a named Uncap product. Both are built during implementation on top of the pricing and fitment engine, and both should appear in a scope and a price rather than on a feature list. Ask every partner you shortlist where they have built both before.

ACES and PIES fitment with a persistent garage. Buyers select year, make, model and engine, keep the vehicle across visits, and see a catalog filtered to what fits. One fitment source feeds both the trade and consumer experience.

Jobber, fleet and dealer tiers enforced at checkout. Negotiated shop rates, jobber tiers, fleet discounts, warehouse distributor pricing and volume thresholds resolve to the price in the cart, not a correction after the order.

Cross-reference against competitor SKUs. A buyer holding a competitor's part number reaches your equivalent, as built for E3 Spark Plugs.

Diagram-based ordering. Clickable hotspots mapped to live SKUs, assembly trees, fitment-aware filtering, and import of your existing schematics with callout mapping.

Trade portal with real account structure. Uncap Portal gives buyers multi-user accounts with roles and permissions, where each buyer sees their own assortment and pricing, alongside order history and reorder tools.

Quoting for fleet and program business. Uncap Quotes runs the full configure, price, quote workflow inside the Shopify admin, with negotiated prices, tiers and volume breaks applied automatically, approvals routed to the right approver, revisions that keep the version history, and an approved quote converting to a Shopify order in one click.

ERP integration without a middleware subscription. Uncap Connect syncs pricing, inventory, customer accounts and orders between Shopify and the ERP. Thirteen integrations are published, including Epicor P21 and Kinetic, Infor SX.e, M3, CloudSuite, SyteLine and LN, NetSuite, Microsoft Dynamics, SAP, Oracle, Sage, Acumatica, Odoo, QuickBooks, Fishbowl, Cin7 and Syspro.

A packaged automotive path. The Uncap Accelerator for automotive is a fixed-price Shopify B2B implementation built around Garage fitment, launching in as little as 45 days.

Three published automotive builds, not one. Kooks with 22% higher conversion and 38% lower total cost of ownership, E3 Spark Plugs with a global B2B site and a cross-reference tool, Scooterworks with year make model search and shoppable diagrams. Two carry attributed customer quotes.

Fitment is a product, not a services line. Uncap Garage is a shipped Shopify app built on ACES and PIES, not a custom build quoted fresh for every client.

The automotive vertical is packaged. Automotive is one of three verticals with a fixed-price Accelerator, which means the scope has been run enough times to be priced up front.

Honest about what is built versus what is configured. Core charges and supersession are built during implementation. You will get that in the scope rather than discovering it in week six.

Related pages: Machinery and Equipment for equipment and powersports catalogs where fitment runs on model and assembly rather than vehicle year make model, and Industrial Supply and MRO for shop consumables and equipment sold alongside parts.

Bring the catalog. Specifically bring the part of it you are least proud of: the applications nobody has audited since the last migration, the supersession table in a spreadsheet, the brand line whose jobber tier is an exception to every rule.

Talk to Our Experts, or start with a Blueprint, the paid discovery engagement that maps channel architecture, ERP integration, fitment data configuration and pricing model before any build begins. You leave with a complete architecture and build plan whether you build with Uncap or with someone else.