Those blue wheels in post # 21 Ken are most likely late 40s early 50s with the SIX clips . Usually they are 4 1/2 wide. They have the correct rim profile but will be a different offset and width than the late 50s early 60s 3 clip 16x5 . They will bolt on but Ive never tried them over disc brakes. Personally I wouldn't waste the money. Your 1965 would have come factory with either 15 or 16 with nubs or 17.5 with clips. Im doing a 1966 GMC 4x4 panel that will have the 17.5s back in place.
Heres a 1963 with 17.5s.