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1997 Sierra 1500, rear differential, Pinon Seal and Oil Fill Plug.

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Greetings all,

I have a 1997 1500, with a 8 5/8 diff and I am looking for part numbers / vendors to purchase the rear Pinon Seal and Oil Fill Plug. Yes,  I have searched but I am coming up with all kinds of Seals and not sure what size the oil fill plug is.  


Since I am replacing the real pinon seal, is there anything else I should inspect / replace.  


Any and all information will be greatly appreciated. (if you need  the VIN to find the correct parts, here it is 2GTEK19R4V1537117)


Thank you!

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