The verdict in three sentences
A spare-parts store lives and dies on fitment: without a vehicle selector, 25 to 35 % of orders come back because the part doesn't fit. A make/model/year selector plus OEM-reference search cut ordering errors by roughly 70 %, bringing returns below 8 %. With a well-structured catalog of 5 000 to 50 000 references, the 20-35 % margin is finally protected.
The fitment selector, heart of the system
Without fitment, the customer orders blind and gets it wrong. The table shows the direct impact on returns (2026 order of magnitude).
| Catalog approach | Return rate | Ordering error | Satisfaction /5 |
|---|---|---|---|
| Simple list, no fitment | 25 - 35 % | High | 2.8 |
| Keyword search only | 18 - 25 % | Medium | 3.3 |
| Make/model/year selector | 8 - 12 % | Low | 4.2 |
| Selector + OEM reference | 5 - 8 % | Very low | 4.6 |
Moving from "no fitment" to "selector + OEM" divides returns by four and transforms the customer experience.
Economics of a structured catalog
Structuring a parts catalog is costly upfront but amortizes fast thanks to avoided returns. 2026 reference base for a mid-sized store.
| Element | 2026 value |
|---|---|
| Number of references (SKU) | 5 000 - 50 000 |
| Average basket | 15 000 - 60 000 FCFA |
| Gross margin | 20 - 35 % |
| Restock lead time | 24 - 72 h |
| Structured catalog cost | 800 000 - 2 000 000 FCFA |
| Returns avoided (per 100 orders) | 20 - 27 parcels |
| Average cost of a return | 3 000 - 6 000 FCFA |
On 500 orders/month, going from 30 % to 8 % returns avoids about 110 returns, i.e. 330 000 to 660 000 FCFA saved each month.
Mini case study
Moussa runs a parts store in Nairobi, 500 orders/month, average basket 35 000 FCFA. Without a selector, he suffers 30 % returns, i.e. 150 returns/month at 4 000 FCFA logistics cost: 600 000 FCFA/month lost, before counting cancelled sales. After deploying a make/model/year selector (1 500 000 FCFA investment), his returns fall to 8 %, i.e. 40 returns: 160 000 FCFA/month. He saves 440 000 FCFA/month and repays the catalog in under four months.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
FAQ
Why are returns so high on auto parts?
Because without a fitment selector, the customer orders a part that doesn't match their vehicle. Without fitment, 25 to 35 % of orders come back, versus 5 to 8 % with a make/model/year selector and OEM reference.
How many references do you need to manage?
A spare-parts store typically manages 5 000 to 50 000 SKUs depending on ranges covered. A structured catalog with vehicle attributes is essential from a few thousand references.
What is OEM-reference search?
It's the ability to find a part by its original manufacturer number. Combined with the vehicle selector, it drives the error rate to its lowest, around 5 to 8 %.
What margin can you expect on this kind of e-commerce?
Gross margin sits between 20 and 35 % depending on suppliers and range mix. Avoided returns directly protect that margin, hence the importance of the selector.
How much does a structured catalog cost in 2026?
Between 800 000 and 2 000 000 FCFA depending on reference volume and richness of fitment attributes. The investment usually amortizes in a few months thanks to avoided returns.
Let's talk about your project. We build your parts e-commerce with a fitment selector and OEM search. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
