You need the tool to install the rivets. Maybe someone will chime in as to where you can get the tool from. Here are the rivets.

https://www.yearone.com/SearchResults/1966-74-A-B-E-Body/mirror%20inserts

My friend Sylvia Rest In peace

http://www.firstgiving.com/talightning

https://www.youtube.com/channel/UC1UKJLKLUn3grkTq-T1-KCg