Rearview Mirror Adhesive

I'm about ready to bite the bullet and buy a replacement mirror for the AZDart. It'll never be a show car, so "correct" is not an issue. The plan WAS to buy a replacement glue on mirror with a two-part glue kit, follow the directions and have done with it! Now that the first two mirror hanging buttons have fallen off when I hung the mirror it's gettin' kinda frustrating!

After spending hours on the net it seems that there are at least four different adhesive kits and the small print on the back of one of the cards (that the seller was kind enough to post a picture of) mentioned that their stuff "works best" on the metal buttons that seem to be most common. Mine (of course) is plastic!.

Does anyone have recommendations for a mirror replacement glue that WORKS??

Thanks!

BC