I have a Chevy Malibu 2005. And my passenger sun visor mirror thing is broken the cover plate. How do I fix the mirror plate?
go to a junk yard and buy a take out part from them. you benefit two ways: you learn how to take it out yourself, which makes it easier to put it in correctly.
you can figure out what tools to take with you by looking at your visor, and planning accordingly.
After you give up on finding the proper make/model/year/color at the junkyard, go to the dealer and buy the correct part.