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Pontiac used chevy style 12 bolt rear ends for their 455 a-bodies in 70, 71 and 72 and they had c-clips.
 

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That's what I figured. But, the guy who made that statement, is a lot smarter than me. So, I just wanted to be sure. :)
 

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'70-72 factory 455 Pontiac A bodys and GP's along with '70 400 4spd GP's all were equipped with McKinnon built 12 bolt differentials.

The Pontiac usage McKinnon 12 bolt included:
- specific axles, c clip retention, but not the std duty chebby 12bolt c clip axle
-3R pinion flange, not the Chebby's smaller Spicer 1310
-use the same backing plates and drums as Pontiac A body's, not the smoothie style drums and style of backing plates with the spotwelded on edge used in millions of Chevelles, Camaro's, Elco's, Monte's Nova's, '70-74 Firebirds and '71-72 Venturas

'70-72 factory 455 Pontiac A body body styles had their own specific frame, so did '70-72 Buick GS 455's.
 
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