WTB 1969 Plymouth GTX Gas Tank neck crimp ring

[Chimpanzeeface]

I am new to classic car restoration and recently had to drop the gas tank out of my father-in-law's 1969 GTX there is a ring that holds the tank neck to the body that broke when we took it off. It's a 2 1/2 crimp ring or some such. Any information as to where I could get one would be helpful.

 

[1970 Roadrunner]

Most hardware stores in their irrigation section will have them.