You'll likely break off a few of the bolts anyway, so what I'd do is just tighten them and break them off. You'll want to use new bolts anyway, as the underside of the rear fenders gets pretty rusty. There are 10 per fender, IIRC.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.