Filler pipe to gas tank O ring leak.

Anyone know where I can buy the rubber o ring that isn't $30.!!? I don't mind spending more because this is an 57 Plymouth Belvedere, but "come on Man" I don't like feeling like I'm being ripped off!
In an earlier post I mentioned that when I removed the gas tank cap I'd hear a whish of air and figured the cap wasn't venting. I fixed that. Now, for the first time I filled the tank all the way up and over filled it a little by accident. I drove it a few miles and parked it in the garage...

Read more