Gas cap resto

[R68GTO]

Planning to re-plate my original gas cap. Is there a source for a replacement fiber seal or do I need to be extra careful digging mine out?

[quik9r]

I think it is cork and rubber(nitrile)

[firstgenaddict]

It is a fiber seal, and the hole is large enough to fish it out and install a new one, I have just used fiber gasket material of the correct thickness and cut to match the one I removed.