Please help.76’ C30 dually 2wd wheels question

[Kemotors]

I’m doing my first dually and need wheels. The truck is a 1976 Chevy C30 2wd. I’m lowering with a 6/8 so the wheels must sit a little in. They can not stick out. I’m having the hardest time finding a set of 20”-24”
Wheels that fit with out adding a adapter. The wheels are 8x6.5 but I have no clue what the offset is does the rear wheels have two different offset? Any help on what to shop for when it comes to rims. Thanks

 

[Charlie]

 

[Big Chip]

I think you're stuck with adapters unfortunately. I don't remember the offset for the stock wheels but I believe they compensate for the adapter with the offsets on front and rear. If I'm not mistaken they will be different but the stock wheels all have the same offset.