More trouble than their worth, I think. Round 2 with trying to get the mount installed, one of thin washers that protect the rubber have come off, again. I'm not sure I would fault the adhesive though, the mount is too effin wide to go into the mount bracket. This time I'm going to try to remove a bit of the rubber on each side, bevel the edges of the already thin washers, and hope for the best.
That is, unless someone has a more brilliant idea?