Ed, The picture isn’t mine, just one I found on the web. Here is a picture of a reproduction unmounted mirror arm offered on eBay that may help show how it should mount.
Hope it helps answer your question. If not, let me know and tomorrow I can look in my 1955-59 FAM to see if there is a better diagram.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
