60-66 disc brake spindle/rotor combo

[66c10283]

I'm in the process of installing disc brakes onto my 66 c10 long bed. Now I have a friend that said he used 1972 spindles with the 72 calipers and a 1991 c2500 six lug rotor on his 1965 c10. I wasnt there to watch the install nor have seen the completed work. Would this rotor even fit on the 72 spindle? If so what bearings would I use? I want to keep my six lug, 15x8 truck rallys for sure.

Thanks for all help.
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