If you put a bolt THROUGH the rubber and attached it to each side then effectively you have no isolation. What should work good is the old type of cylindrical isolator(same as I used to mount my shrouds) between each side, and a spacer of the same length to bring the mounting surface of the pipe tab back to position. No drawing, but can you visualize that?
I had a pipe last so long that the surfaces of the flange actually wore out where the orings seated, so it was always loose and leaked after a few rides with fresh orings. You can source orings just SLIGHTLY bigger for a tighter fit. Eric K has done this, do a search, I'll have to try it myself.
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