Filler cap for what? The local junk yard by me has 3 Chevy Aveo's in the lot. I have taken parts off these cars a few times now and replaced things on my 05 Aveo that has made it like new. I'm sure your cap you need is on one of them. Possibly I can go get the cap and mail it out to you if need be. Has to be way cheaper then buying one from the dealer.