Air cleaner adapter gasket

[Tdean91491]

Anyone having any luck finding an OEM or a suitable aftermarket replacement for this gasket/seal? The adapter is number 16 in the parts diagram.

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[df2x4]

GM/ACDelco doesn't sell them separate from that assembly unfortunately. I know I've seen people talk about finding replacement o-rings and epoxying them in but I'm not sure if anyone ever did it successfully.