Jim, I think the 69/71 full size fords used a 5" bolt circle. I'm not 100% sure but it might lead you in the right direction. I too use Moser axles and I ran into a problem in that the Moser axle bearing retainer rubbed on the axle seal. They said that they see this, but rarely, on 59' thru 64' large bearing housings. Don't know which you got. The Moser retainer measures .600, where the stock one is 3/8ths or so. We trimmed approx. .135 off the retainer all the way down to the axle and it solved my clearance issue. Hope yours works ,but if not , don't panic as it's an easy fix. Don
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