I just measured the one I have from a Chevy 46 3/4T panel. Tape measure hooked on to the threaded end right at the tip, I get 36 1/8" to the center of the bolt hole in the front. Hope that helps a little.
1947.2 GMC 1/2T SWB panel 1947.2 GMC 1/2T long bed 1948 GMC 1/2T short bed