First, do not require so many drop downs to be filled, ie model, year from/to, etc. On a car only made in two/three basic flavors for only 5 years, just unnecessary stuff to fill out. On location, may not need quite as much there, but it wouldn't feel like having to fill out so much if some of the other items were not required.

​​​​​​ Breaking the categories down to interior, trim, suspension, engines, etc sounds intuitive, but again, with so few cars involved, and the likelihood that a seller will have parts spanning several of those categories, it just becomes cumbersome, especially if the seller has to fill out the form for each part. I do agree having the form ensures some basic info will be in every post, such as price, location, etc, so that part is actually an improvement.