Unsuccessfully searching for thick and 'L' shaped gasket (part 2.660 on page 240 of Cadillac's 1959 - 1965 master parts list CD) that goes between the actual fin and the metal body coloured piece (2.680 Adapter) to which the chrome brake light (2.680 Body) presses. (Then there's a conventional rubber/foam gasket [easy to find] and finally the red lens to hold everything together.)
Any suggestions where to find?
Thanks...