Lemans 2 Petrol cap rubber seal

Just wondered if it is possible to get a new rubber seal for the petrol cap on my lemans 2. I nicked it form my T3 cali which was missing. GB say they can’t get just the seal. Have to by the whole cap. Or is there a petrol tolerant material I can use to make a new one?

Would an O ring work?

Otherwise à bit of rubber sheet cut to size?

Viton sheet is the stuff to use. Readily available in various thicknesses.
Ian

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Ideal

Thanks all