I thought you were going to do all the work!!
I think there were 4 or 5 different outer flange's between cars, trucks and different years. I'll see if I can dig up the specs for our year of trucks with the 6 lug rear.
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1972 C/30 133" W.B. C&C
1970 GMC 3500 157" W.B. single wheel C&C
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