Here is a back side shot of the extension that shows the mounting tin attached to the extension. It is not riveted on but use rivets that are flush mounted as extra "glue grabbers" as I call them. It helps with the attaching material's sheer strength immensely. The back surface is filled to match the window curve and a piece of double sided tape gets installed with a long backing tail that will get pulled once the mirror is finished and properly positioned on the window. The tape holds the mirror from slipping back and out of the rubber and does add to the holding power.
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