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Autozone in Marble Falls didn't have it and said they don't carry it anymore. I'll probably just use some silicone gasket in a tube. I would assume it would be fine.

You have a Walmart in Marbles Falls as well... check their auto section next time. As far as using silicon, it should work. Silicon does fine unless it comes into direct contact with gas and then it disolves into a goo...

go to a home depot or lowes, look in the elect. section, they have it, it is very common