I removed the two bolts holding the top Arm of the hangar but it does not help in removing the rubber grommet,even with the two bolts out the top Arm does not come off over the Metal ledge?
And is backdraft the only source for this rubber grommet I found this item below but nowhere does it give Its dimensions.
Bosal 255 681 Exhaust Hanger Parts Rubber Mounting | eBay