The Automotive Aftermarket is a thriving eCommerce sector. For an independent seller, success depends on partnering with platforms that allow you to list, price, and fulfill your own inventory. This blog focuses exclusively on marketplaces that support this third-party seller (3P) model.
Below is the definitive list of top marketplaces where you can sell auto parts directly to consumers in the US and UK as a third-party seller, including their massive monthly visitor numbers.
US Marketplaces: Volume, Scale, and Niche Players
The US market relies on a few behemoths that have invested heavily in the complex ACES/PIES fitment data required for auto parts sales, alongside high-traffic generalists who are now welcoming automotive sellers.
1. eBay Motors
As the long-standing king of auto parts, especially for the enthusiast market, eBay is a pure open 3P marketplace. The platform sees a massive US and global audience, accumulating over 850 million site visits globally each month, with the US contributing the majority of this traffic.
- Best For: Sellers of used, rare, classic, and high-value performance parts. Its flexible listing format allows sellers to sell everything from salvaged components to new performance upgrades. The Final Value Fee (FVF) is typically 13.25% for most parts, tiered for high-value items.
2. Amazon (Automotive & Powersports)
Amazon provides unmatched volume and convenience for the modern online shopper. Amazon.com receives a staggering 2.5 to 2.8 billion site visits every month, ensuring the largest possible audience for your listings.
- Best For: New, high-volume, and branded aftermarket accessories and maintenance parts (like filters, fluids, and batteries). To sell here, you must be approved for the Automotive category, comply strictly with the platform’s Part Finder fitment system, and sell only new items. The referral fee is typically 12% for most parts, dropping to 10% for tires and wheels.
3. Walmart Marketplace
Walmart is a rapidly growing eCommerce powerhouse, attracting over 100 million unique visitors every month to its site. While a 3P marketplace, it operates on a highly curated, invite-only basis, focusing on quality and scale.
- Best For: Large-scale distributors and major brands selling new OEM and high-quality aftermarket items. Walmart vets sellers rigorously for a proven track record. The referral fee is typically 12% for most auto parts. Used parts are not permitted.
4. Newegg Marketplace
While traditionally known for electronics, Newegg has aggressively expanded its marketplace to include auto and industrial components, operating as an open third-party seller platform. The site receives approximately 40-50 million visits per month, providing a large, tech-savvy audience.
- Best For: Automotive tools, gadgets, diagnostic equipment, and specific electronic parts that appeal to their tech-focused customer base. Newegg offers competitive commission structures for marketplace sellers.
5. Rakuten (US/Global)
Rakuten runs a global eCommerce marketplace that is open to third-party sellers and has a dedicated parts and accessories category. Its US site contributes to the global Rakuten network, which sees hundreds of millions of monthly page views.
- Best For: Sellers looking for an alternative channel with lower competition compared to Amazon and eBay. Rakuten offers robust marketing tools and a focus on its loyalty program, potentially attracting repeat buyers for auto care and accessory items.
UK Marketplaces: European Reach and Dedicated Retail
The UK market features the global leaders alongside strong local and niche platforms that offer competitive terms for independent sellers.
1. eBay UK
eBay remains an essential channel for the UK market, often seeing upwards of 134 million site visits every month to its UK domain. It is the established hub for the UK’s massive DIY and automotive enthusiast community.
- Best For: Accommodating the full spectrum of conditions: New, Used, and Salvaged/Breaker Parts. The UK audience relies on eBay for hard-to-find components and parts from vehicle breakers, making it indispensable for niche inventory.
2. Amazon UK
Amazon’s UK site dominates general eCommerce traffic, receiving well over 327 million site visits per month. This colossal audience makes it the go-to for convenient and fast delivery of popular car accessories and maintenance items.
- Best For: Branded car care products, accessories, and fast-moving, smaller replacement parts that can benefit from the Prime fulfilment network. As with the US site, sellers must adhere to strict fitment data requirements, and only new products are allowed.
3. OnBuy
OnBuy is a fast-growing UK-based pure-play marketplace that has recently reported traffic trending towards 7 million monthly users. It stands out by guaranteeing not to compete with its own sellers.
- Best For: UK-based sellers looking for a high-traffic alternative that offers competitive commission rates and a more direct focus on seller success. OnBuy simplifies the listing process for car parts by exempting them from strict barcode (GTIN) requirements.
4. AUTODOC Marketplace
While Autodoc operates a large retail business, it has recently expanded to offer the AUTODOC Marketplace—a platform explicitly open to verified third-party sellers. This gives sellers access to Autodoc’s colossal pan-European traffic, which can exceed 20 million monthly visits across its family of sites.
- Best For: Sellers with high-volume, new replacement parts and a strong logistics network capable of servicing the UK and potentially the broader European market. This is a curated channel that requires strong data and professional standards.
5. B-Parts
B-Parts is a highly specialized platform focused exclusively on used and original OEM parts, sourced primarily from vehicle dismantlers and breakers. While global, it has a strong operational presence across Europe, including the UK, and is a pure third-party marketplace for sellers of used items. The site lists over 11 million parts in stock.
- Best For: Vehicle dismantlers, breakers, and sellers of high-quality, warrantied used OEM parts. It provides a highly targeted, professional environment for selling salvaged components with guaranteed one-year warranties on most parts.
Choosing Your Auto Parts Marketplace: Strategy by Objective
The automotive aftermarket is highly segmented, and the best platform for selling a used engine is completely different from the best platform for selling a box of oil filters. Your marketplace strategy should align directly with your inventory type and target customer.
Below is a strategic guide for independent third-party auto parts sellers targeting the US and UK markets.
| Objective | Recommended Marketplaces (US & UK) | Key Strategy Note |
| Maximum Volume & New Aftermarket Scale | Amazon (US/UK), Walmart (US), eBay (US/UK) | Focus on new, commodity, and fast-moving items (e.g., filters, brake pads). Requires FBA/fast fulfilment and perfect ACES/PIES fitment data to compete. |
| Used, Rare, Classic & Performance Parts | eBay Motors (US/UK), B-Parts (UK/EU) | Ideal for used/salvage components, specialist upgrades, and classic car parts. Prioritize high-quality photos, detailed descriptions, and transparent warranties. |
| Value-Conscious & Private Label Brands | Walmart (US), OnBuy (UK) | Utilize platforms known for competitive pricing. Requires low referral fees and efficiency to win the Buy Box. Excellent for private-label or economy brands. |
| Tech, Tools, & Diagnostic Equipment | Newegg Marketplace (US) | Leverage a customer base already focused on electronics, computing, and complex components. Target DIY enthusiasts and small garages with high-quality tools. |
| Pan-European New Parts Distribution | AUTODOC Marketplace (UK/EU) | Best for established distributors offering a massive catalog of new replacement parts. Requires professional-grade fulfillment and data integration to service the wide European network. |
| Accessories & Car Care Products | Amazon (US/UK), Rakuten (US) | Focus on items that do not require complex fitment (e.g., cleaning kits, mats, phone mounts). Marketing can be more important than part number accuracy. |
Your Success Factor: Data, Not Just Traffic
For all these platforms, your success as a third-party seller hinges on guaranteeing fitment. Every one of these marketplaces demands precise fitment information (via ACES and PIES data standards) to avoid high return rates and account penalties.
Need help managing your online auto parts orders or customer support across multiple marketplaces? Book a demo with eDesk today and discover how we can help you centralize messages, streamline operations, and grow your business with less effort.
