8 1/4 rear with pinion snubber

I have a 67 Dart with a 8 1/4 rear sure grip. I have a pinion snubber but for the life of me cant find to much info. Im in need of the rubber. Is it the same as a 8 3/4? Im going to need one eventually and when i search all i can find is 8 3/4 rears with them. Thanks in advance.

I'm sort of in the same boat as you - got an 8.25 rear. I removed the rubber bumper from the snubber and put it someplace where it wouldn't get lost while the snubber was blasted and painted - of course now I can't find it! Mine was definitely different from the 8.75 snubber so I'd bet yours is too.