Any source on replacement gasket for 71 gas cap?

Thanks everyone for the suggestions, i crossed over that gates number 31743 provided by @66Valiant528 to a stant 10800 cap from oreillys. We get a little bit of a price break from oreillys through my work so i ordered one with my cost being $10. The gasket swapped over perfectly although the stant cap doesnt fit which i knew it wouldnt. I could of probably bought a large rubber washer from ace hardware and then cut it to match the dimensions but id rather spend some more and not have to fool with it. I tried putting the cap on with the seal dry but could only get it turned 1/4 of the way. I put a tiny bit of dielectric grease on the seal and was able to get it to turn all the way, it is snug but doesnt feel too tight. I assume after awhile of it being compressed it will be a little easier to turn


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