Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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Believe you have misread the casting number. it's fairly easy to do, 8's, 9's, 3's all look fairly close when degraded from rust, poor casting transfer, or globs of paint, the worst is powdercoat.
9799202 is a later Pontiac 8.2 10 bolt out of a '70-72 Pontiac Abody. As a mid '66 and later Pontiac 8.2 10 bolt, it is 1/2" wider on each side than the original '65 Pontiac 8.2 10 bolt which would have casting number 9779822. The "202" is a better rear, nodular casting, and will have tapered bearing axles.