small bolt pattern hangup

So I have a 1972 Duster 340 ....looking to set up with cragar mags...(I have been doing some research on this site and jegs etc, on this problem) seems like the cragar small bolt patterns are obsolete....looking for a good manufacturer of axle shafts with larger bolt pattern..
Have 8 3/4 diff. last 3 digets of cast 489...but seems strange this differential has small pattern.Thanks
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