The sheet in the Factory Assembly Manual might be useful but be careful. The bed side-panels/rails changed in 1954 (the drawings in the FAM are for a 55-1st truck).
There is a flat top in 54/55 but an angled top in 53. The mounting brackets for the spare carriers for 53 and 54 are necessarily different (to bolt to the differently angled tops of the different rails). Thus, the bolt holds may or may not be correct.
The measurements in the FAM might not be correct for a 53 bed. However, the bed-front to fender distance is the same, so you can most likely use that important measurement from the FAM.
