I know the 12 bolts came on the '70 Z-28's, were they also available on the big block SS's for '70? The one I'm looking at also has the F-41 with the 9/16" rear sway bar.

12 BOLT REAR ENDS CAME IN Z28,S AND ALL SS CARS, SMALL BLOCK OR BIG BLOCK. HOPE THIS HELPS! OH,BTW 1970 ONLY, FOR SECOND GEN CARS.

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1970 Z-28,1970 SS396 L78,1972 SS396,1973 RS Z-28

Thanks. Do you know if a '70 with 10 bolt and possi with 4.10 would apply to any particular car? My '70 I have now had a 10 bolt like such, way back when before I broke all the ring gear bolts.