..some sort of plug for antenas and mirrors. I currently removed the passenger mirror and my antena and wanted to know if anyone makes plugs for the empty holes?...

 

why would you buy then you just make then with sheetmetal and wel them in smooth

 

I don't know of a specific item, but you might try a body plug like under the seats etc. seams like they might be about the same size as the antenna hole.
Good luck.

 

Measure the holes carefully, then take those measurements to a hardware store and see if you can find some. I don't know of any vendors who specifically those. They do however sell a rubber plug kit which consists of about 32 rubber plugs at 15 bux.