I've used Dii goodmark AMD gold legion I think it depends I have found AMD seems to be the best quality on some of parts the hoods and deck lids are good the 69 front fender not so much I had to do a lot of work to get that to fit right And AMD has the thickest sheet metal I've found so far. AMD has some of there own stamping dies but truthfully I think most parts are stamped in the same factory. So its pretty much a crap shoot I buy mostly from summit so if a part is really bad I can return it