The new bolts have arrived. The fit is also perfect. Thank you @walterhvogel for the info. I had tossed my old hinges so I did not see the difference. I am wondering what year this change was made to the larger shoulder? Maybe it is just the repop hinges that have the larger size?


1947.2 GMC 1/2T SWB panel
1947.2 GMC 1/2T long bed
1948 GMC 1/2T short bed