What side mirror glass adhesive

windshield urethane caulk or 3m foam two-sided tape ?? tough stuff !!!
https://www.bing.com/aclk?ld=e8rz2b...1&rlid=e3ff435772c8134d41f823572d8e5745&ntb=1

https://m.media-amazon.com/images/I/81Pdx0pysnL._AC_UL320_.jpg

NAPA sells replacement mirror glass
https://www.napaonline.com/en/search?text=replacement+mirror&referer=semantic&se=1#