Need Gasket Part #

[87 GN WE2]

Does anyone have the part number for the stock down pipe donut gasket?

 

[gsgns4me]

GM number was 1262500

 

[87 GN WE2]

Thanks for the part number. Not sure if it is still available from GM. What about an after market part number.

 

[David65]

Looks like about a hundred left at $36 ea. Did some looking and found a 521830 from Arvin/Maremont for $9 at Autozone. Can't remember if it looks like this or not.