Don't think you will have that problem with this one. It is made out of Buna-N / Nitrile rubber. Read the description. You can email Jim (the owner) and he will answer any questions you may have.

https://www.ebay.com/itm/Mopar-A-B-C-Body-64-74-Fuel-Gas-Tank-Filler-Neck-Tube-Rubber-Grommet-Seal-DMT/360963621791?hash=item540b1bc39f:g:wi4AAOSwDDxa2VwM:sc:USPSFirstClass!35243!US!-1