Is the chrome wheel well trim the same on a square body Ford as it is on a flareside or step side?

Just search on line for aftermarket supply stores, or just order it from the dealer.

yes, but you have to rivet it onto the rear fenders, because screws wont hold in the fiberglass.

LMC Truck (Parts and Accessories) puts out a FREE catalog every four months for FORD Truck, FORD Bronco, 1980 to 1996, 1/2 Ton, 3/4 Ton, Go to their website LMCtruck.com to register your address and other information to receive their FREE catalog.

You can use catalogs, on line auto parts stores and any other listings of parts/part numbers to cross reference vehicle makes, models, years and parts to find exactly what You need.

Haven't use them ina couple of decades, but J. C. Whitney use to have all sorts of stuff like that.