[oldman3]

[QUOTE=8man;8043317]I like the 54 bed, and may go with that if the front bed piece, tailgate, tailgate hinges, and bed frame supports will work with the 54 bed, because they are all new in the box and the 54 bed has none./QUOTE]

54 and 55 lst series beds, are completly different that the 47-53 beds, nothing will exchange. Rear fenders can be used. Here are a couple pics for visual difference. Hope this helps...Jim

Pic 1 Here's a 54 bed mounted on a stock 50 frame (mine) which required some modifications.
Pic 2 Tailgate and how it mounts to the uprights, with flat top on bed sides.
Pic 3 Old rusty bed, but you can see the shorter front panel and the sloped bed sides.
Pic 4 Different mounting style for the tailgate on the 47-53.

Another note the splash arpron between the bed and running boards are also different. 54-55 short height and 47-53 taller height.