I managed to get them both out today using a propane torch and an air hammer. I figured that if I had any chance of getting these out easily I needed to be able to impact the metal insulator directly to get it loose. All the rubber was going was softening the impacts, so it had to go....
So I burned off all the rubber on the bushing with the torch, lowered the frame enough to get a good angle at the top of the sleeve/bushing and hammered away. Popped right out!
