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This is the only seal that was a close fit for my diff. mine mesured 1.855 I.D x 2.5 O.Dx .42 thick I suggest you mesure your and make sure this is the one for you. I first bought one that is on a parts list I found on the web and it wasn't even close to the right one.here is a linl to the napa...

Here are some pics the box the seal came in looks like sks made for napa auto parts and one of my diff. before and after.

Here is the seal number 18656 it is a napa part.

Found one.

Has anyone found a Pinion seal that will fit into the pressed metal ring in a "small 8 3/4 " differential?