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Reg,
I replaced the body mounts in my 81 a few years ago. It was really no big deal. You just need to jack up the body a few inches, I did not even have to disconnect anything to lift the body up enough to clear the old mounts. If you want you can e mail me at rcooper1@hvc.rr.com and over the weekend I will tell you how I did it. I am guessing that your 75 is the same as my 81.