Other option is black gloss vinyl wrap, to cover the existing rubber gromet and just the front of the base to black the wind. They also sell thin rubber strips, you could custom cut a small black piece and glue to the rubber gromet already there. Or last you could try Permatex gasket maker and spread around base in very thin pattern or something like it. You just need an artist touch and it will likely not even be noticeable
However, I would remove the mirror, use the existing gromet as a guide and make my own
Sent from my iPhone using Tapatalk Pro