WTB: S3 Spider Spoiler Brake Light Cover

Looking to replace the black plastic inset that clips underneath the hard rubber spoiler and covers the wiring/access to the third brake light on a 1986 Spider Graduate. Pic attached in case my description doesn't make sense.

Thanks, guys. One of those small annoyances that I notice each time I open the trunk (and therefore, one of those things I'd pay through the nose to fix). If you have one, let me know via post or PM.

Many thanks and Happy New Year!