A classic car part store sells to a project, not to a car that needs fixing today. The buyer is somewhere inside a restoration that may run for years, and their question is not only does it fit, it is is it correct. Correct for the model year, correct for the trim, correct enough for a club judging sheet, or simply good enough for a car that gets driven on weekends.
We work with classic part stores that already sell online: reproduction panels and trim, new old stock, rebuilt and remanufactured components, gaskets and rubber, interior kits, electrical and glass, usually organised by marque and model year rather than by a modern fitment database. The plan starts by shopping your store the way someone stripping a car over the winter does, with a parts list on paper and a printed catalogue open beside the laptop.
Conversion and order value both depend on the same thing: whether the page says what the part actually is.
A restoration is bought in stages, and the stages are long. Teardown and assessment, bodywork and panels, mechanical rebuild, paint, then trim, glass and interior at the end, with months in between and a budget that gets reassessed constantly. A store that knows which stage a customer is in can be useful to them. One that sends the same catalogue to everybody cannot.
The defining question is correctness. There are usually three answers for any given part: new old stock, which is original and scarce, a reproduction, which varies enormously in accuracy, and a used or rebuilt original. A restorer working to a judging standard wants the first or an accurate reproduction and will pay for it. Someone building a driver wants the part that works and looks right from a few feet away. The listing has to say which one it is selling.
Identification runs on part numbers, casting numbers and date codes rather than on a modern lookup, and interchange matters because one part often serves several years or several models. Buyers arrive with a number from the old part or from a manual and search for it directly.
Many of these customers still order by phone from a printed catalogue and expect to speak to someone who knows the car.