Unusual Problem
 

I have a 2000 Cadillac DeVille. I can not find a gas cap that fits it. I even took the gas cap off of another 2000 Cadillac DeVille and it would not fit. I have tried gas caps from dealerships, auto stores and garages but if it suppose to fit my car it will not work. They all say the same thing... that the gas caps are to big but that everything looks like the original parts on the car. The old gas cap became so tight that it broke in two. Any help?

Did you try any of these?: https://www.rockauto.com/en/catalog/...+tank+cap,5900

I looked through them. I have already tried them. They don't fit, but thank you.

I think we're going to need pictures. This should be standard parts.