has anyone tried these for fuel filler neck seal / grommet?

https://www.airheadparts.com/vintage-vw-parts/vanagon-fuel-filler-assembly/fuel-filler-grommet-50-37-251201139-a
made for volkswagen

or ordering a custom viton part?
Rubber Grommets | Grommets Rubber | Rubber Grommet Manufacturers

or found any other viton solutions for the fuel filler neck seal grommet?

thanks,