1) They are repopping FGF subframes new. Rick's Camaros sells them. When you buy used, besides the obvious potential for rusted out mounting areas, you will have no way of knowing if that subframe is bent or not. I got my subframe from a yard after seeing the 4-door (granny special) '68 Nova it was under to verify the car was not abused.
2) Upper "A" arm compatability. The bump stop location was different for all 3 years (67-69). You have to match upper control arms to subframes or go with aftermarket arms which have mutiple bump stop mounting points.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI