I have a partially disassembled '65 C10, in the process of replacing the front fenders, inner splash panels and core-support. the majority of the bolts for these items are special GM, they are generally pointed on the tip and have an unusual shoulder head., I have some spare bolts because I parted out a '65 cab. If it would be of any help to you I can snap some pix of the correct bolts. Wm