1970 GMC C2500 rear axle hub diameter?

[Richard]

In my experience I have not recall having seen 8 lug hub centric wheels. The older stuff was not AFAIK. Honestly, in the newer vehicles I have worked on I never even thought about it. The temp wheels on my 72 truck are not hub centric as well as the final US Mags wheels I am using. Have used wheel spacers on the rear of my 94 1/2 ton for many years, not hub centric. I have worked on semi trucks and the Alcoa wheels were not hub centric. Nothing to worry about IMO.