Looks like
Mar-K reproduces the bedsides but they don't appear to have the '54 embossing (
see right bed side ) that sets them off from the later beds.
I noticed that the rear axle is eight lug -- is that a 3600 or a 3100? The 3100 (1/2 ton) tends to be more desirable than the longer 3600 (3/4 ton) and therefore fetch a higher price.