Riviera rear end?

What rear end is used on the 63-65 Riviera's and is this the same as the 62-64 Impalas?

 

The Hollander Interchange states that the 63/65 Riviera is exclusive to a 63/65 Riviera NO interchange

The 62/64 Chevrolet rear end would have a smaller wheel pattern than the Buick anyway

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I have a spare setting in the driveway. It is out of a 64 and is NOT a posi. I will make you a sweet deal. Keith