Oil cooler line gasket?

[Three504spd]

Does anyone have the correct part number or appropriate replacement for the gasket/O-ring that seals the cooler line into the radiator? I removed a green plastic ring with a shoulder to seat into the radiator, anything else I see looks more flat than shouldered. Thanks as always for any assistance.

 

[east302]

On my 1998, I got them from the dealer a few months back.

GM/Delco part number 463015
ID x thickness: 0.426" x 0.07"

I don’t remember if they were conical shaped or round (donut), though.


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