The ones on my 69 are going on 3 years. I bought them from Tamaraz. They sell two different kinds. A cheap mirror, and a better one for like $60.00 or so dollars. They are very tight, have the rib on the base, and the dimple by where the ball is. My weather strip is still tight so you have to close the door pretty hard . Would not hesitate buying more .
1969 x-77 Z/28 orange/ white stripes, named by my daughter "Clementine ", M-22 close ratio, 4:10 12 bolt, CE 302. Hugger orange with white stripes. White standard interior. Restoration complete May 2018