Stooby
Go to 'Tech Tips' and you will find instructions on making (replicating?) the fender mounted spare brackets for your 56 3100. Note that 3200 brackets will not work on the 3100.
Many and maybe most of those brackets were removed and discarded by previous owners after ripping up body parts,clothes,jackets and coats for the N'th time!!
Your 56 should be the same as the 58 shown in that Tech Tip.
delky dave in wyoming


1957, 3100, v8
2016 gmc 4wd