I am working on a 1954 and have bought two used bumpers at swap meets.

For the front I bought one and when I got it home it seems to be curved a bit more than it should to fit the arc of the splash pan well.

For the back I want to run a straight one without the license plate recess so I looked for a 47-53 rear. I brought that home and laid it down next to the front one- and surprise- it seems to actually fit the curve of the '54 front gravel pan.

Can someone explain the differences in bumpers for these trucks- all years front and back - so I can tell the difference at swap meets and not rely on the word of the seller?