I think you will need to look for Accuride 28160 rims
(8.75" 10 hole rims that I believe fit 68-72 Chevy C50 & C60 Medium duty trucks, maybe others--I know they fit 1969 C50).
Wheel Specifications:
Rim Size: 22.50 X 6.75
10 Hole on 8.75" (222.25mm) Bolt Circle (PBD)
6.25" (158.75mm) center hole bore
Mounting Type: Hub Piloted Dual
Offset: 5.93" (150.62mm)
Disc : 0.375" (9.53mm)
Material: Steel
Number of Hand Holes: 5
Recommended Valve: TR500
Approx. Wt. (lbs): 71 (32.2kg)
Capacity: 4675 lbs. (2120kg) at 110 PSI.