[Pillow]

A few weeks ago this question was asked and I did not have a clue as to what the PN was.

So after going to the local Chevy dealer I found the gasket. Actually two. $13 each so not too horrible.

PN # 10137537

I hope this can help someone.

On the 99 it was torn a little during disassembly at some point. On the '96 it was no where to be found!

 

[jackb]

Its only a few bucks at NAPA

 

[Pillow]

Shhh, do not tell me that now LOL

My local NAPA closed, so now I cannot get thier good products.

... We do have an AutoZone, but the products they typically sell are subpar IMO.

Interestingly enough the dealer is the closest parts vendor If it is high dollar parts I definately go mail order though.