Yea it almost seems like the subframe is designed for a 72 idler and pitman the way the 73 stuff looks when you bolt it on, QA1 has it labeled 72 in the catalog, and no one in the tech department/ or the sale department could give me a straight answer as to the frame being designed for use with 72 steering components or not. The only answer I've gotten is from hotchkis and firmfeel, saying that if im using the 73 idler pitman with a 73 centerlink it should work fine, vice versa if im using a 72 pitman and idler with a 72 center link it should be fine, regardless of subframe considering main diff in the subframe years is the engine mounts from spool mount and donut mounts differences, but that leaves the question why from the factory they switched the pitman and idler arm design and center link design when they switched k frames in 73???? I think QA1 engineering needs to readress this issue on the blueprint and recheck themselves lol kinda funny but it really wont be if i have to switch back to factory k frame.