Hy Beewrangler, I don't see 5 stud on an 8.5" bolt pattern as an option for a 1960 Chevy C60. The options listed in my parts book are:
Budd mounting type (option 172) uses an inner and outer wheel wheel nut system on the rear and is six studs on an 8.75" bolt circle, these are stud piloted wheels.
ten stud on an 8.75", bolt circle, hub piloted
Motor Wheels (option 128) six stud on 8.75" bolt circle, hub piloted, uses a single wheel nut front and rear.
If you have something other than those options listed I would have to do a lot more research.
