spec is a brand just like ram. i have a stage 1. it's handles 400hp and 285ftlbs which is more than enough for my 145 underfed horses. i got mine from a place called s and r racing. i found it searching on the web, they're located in pa. at the time they had the lowest price. it comes with press. plate, disc, pilot bearing, release bearing and alignment tool. i didn't use the bearings though. i used ford bearings.