I'm ready to install the taillight extension on
my 66 chevelle but I can not find the correct gasket that goes between the extension and body.
The old gasket was a small round gasket with a lip that sealed to the body. I have ordered the seal from three difference shops and all I get is a flat seal which is incorrect. Has anyone had this problem?

When I took my 67 Chevelle apart that was all that was there..........a flat gasket cut to match the outside profile of the fender. Maybe the 66's are different.
Roger