I have a 1966 chevy truck and will be using 71-87 spindles. I need to know if a 6 lug rotor from a 1988-1989 c2500 would fit. I am a bean counter by profession and not a mechanic. They appear to use the same bearings on the 71-87 heavy duty and on the 1988-1989 c2500 light duty. I will try to use 2005 astro rotors on the back and have the axle hat machined to fit. If this will work modern wheels of various sizes could be used. Thanks.