Some of the reproduction bedsides for a 54-55 truck did not have the indented pattern that followed the fender outline. It also looks like your frame is not a 54 frame. The 54 frame had a different shape over the axle so the 54 bed could be deeper than the 53 and earlier beds. That is the kickup noted in the AI quote provided by KEVINSKI above. It will be a challenge to fit a 54 bed properly to this frame.
Mark
