You can take a look at the bed cross sills for the holes that correspond with where the bed strips are supposed to be located. If the only holes in the cross sills are the ones with the bed strip bolts in them, then you have a 46 or earlier bed parts.
Carl

Last edited by 52Carl; 02/15/2015 2:49 AM.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission