Kevin this is on a 46 … perhaps GM changed up after the war with the AD series.
Picture shows fender - fine threads are found on captured nuts located on the side cab wall where the lower rear fender attaches, radiator support , cowl brackets, where splash curtains and fender attach on radiator support, V brace, captured nuts for lower grille assembly, main brace under fender.
I attached the picture to help those working on a Pre-war truck and because people like pictures.
