The 5 bolt, late 70s/early 80s rotor kit I helped install used an adapter that slipped over the spindle to locate the inner bearing (and therefor the hub/rotor) the proper distance in and out on the spindle. I doubt that a 6 lug rotor would just "happen" to fit unless you were Jerry (Hotrod Lincoln).
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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