We are working on changing that.
You wouldn't believe how hard the suppliers make it to get real inventory and catalog data.
Check out my business, linked in my profile.
BTW- great looking site. I'm checking out now. Shoot me an email at my username at gmail if you've got a chance.
What you are looking is really tough. We are working on simply being able to browse products by fitment.
Unbelievably none of the part fitment data is readily available in a normalized fashion. There actually isn't even a standardized list of makes / models out there. Each retailer has to essentially build this database and keep it up to date manually, which is incredibly resource intensive.
Of course though this means there is opportunity to have because once you have built out this database, there is some defensibility built in.