I looked up the Master Parts Catalog 1929-1950, it has the same part numbers for the bed sides for 1941-1950. So it appears as though your inexpensive bedsides should work. The front bed panel is a different part number, and as suggested by steppenwood, probably wider. The 1946 GMC bed would be steel, not wood, but....
Wait just a minute. What type of utility bed are you attempting to get rid of?
I may be interested in accruing it if it is period correct.
Please send me a PM about your utility body.
46Canopy
