Pinion Snubber Question

I posted a pinion snubber for sale here at FABO, it is one that I had on my 68 Barracuda, 8.75 rear end,,,It is the clean black painted snubber.
A potential buyer asked if it was for an A body,,
I have another 8.75 diff that has a snubber on it, so I compared the two.
See photo.
The one I have for sale is longer in the span between the mounting bolt holes and the center of the rubber bumper.

Why is that? Are pinion snubbers chassis specific, A, B ,C body?

View attachment 1715659389

I didn't know that, but Dr Diff, Trublu (spelling) or someone else on here will probably know.