In a way RockAuto does that. If you find a part for your Reatta that you are interested in you can click on the Manufacture's part number (color blue) and a window will pop up (Buyer's Guide) that will tell you all the vehicles that part will fit. In the photo below you can see what I mean when I searched for a '89 Reatta brake rotor. I always compare prices with RockAuto, Amazon and Advance Auto Parts including the shipping cost. Sometimes Advance will have a 20-25% discount for ordering online and that will be the cheapest price if I pick that part up at my local Advance store.