For what it's worth, when I replaced my body mounts I just lined up the alignment holes the best I could and torqued everything down. It seems fine to me. Not sure how precise it needs to be. It may not be worth all that effort for perfection.
My biggest concern was body panel alignment problems farther down the road at body work time. I wanted to prevent a major "Oh, crap" moment. Probably overkill, but... Kinda like replacing the heater core while I had the ventilation suitcase out from under the dash.
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
