Does anyone know if the bumpers on our trucks have the factory part number engraved on them?
Or better what would be the part numbers on my 64f100 for both front and rear bumpers.

 

As far as I know, the part number is not on the front bumper. The back bumper could be from a number of bumper makers, depending on the type (step, farm hitch, chrome, etc..). If your front bumper is using the brackets where the bumper is held on by three bolts on each side, 61-64 will interchange.