I believe the earlier years, I would think before 1950 (you can check by the different part number in vendor catalogs) had a center bow fastened with screws. After that it was a floating center bow.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!