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The rear fenders are different between the F1 and the F2-3. The F2-3 has a wider bed, therefore the fenders are narrower to "make up" the difference. It would stand to reason that fender braces would be accordingly different, but could probably be made to work with a little effort and modification if the correct ones couldn't be located.
F-1 's are flat on both ends . F-2 & F-3 are flat on one end & curved around on the other end more specific on the 8 ft. express bed . Have a set of the later here .