Filler neck grommet issue – causing gas to leak out!

I am unable to fill the gas tank of my 77 Aspen RT due to the Filler neck grommet (rubber/poly piece in the tank opening that the filler neck goes into) being dry-rotted. Does anyone know if anyone reproduces the grommet - or where I can get one? If I fill the tank past the bottom of the grommet (trying to fill the tank), the gas seeps out from the bottom of the grommet/neck opening.

I tried a few places online, but their info only goes back to 1984. My local dealer was unable to help (I...

Filler neck grommet issue - causing gas to leak out!
Author: 77Aspyn360