I just replaced my fubar LIM this weekend (not as bad as I thought) and discovered several rotted and split vacuum fittings. There is one going into the base of my LIM at the front of the engine that's a tee fitting. The tee fitting has two plastic tubes on either end and the base of the tee attaches to the LIM.
During its removal, I noticed that the rubber tee fitting was dry rotted and split. Previously, I had fixed this using a zip tie to close the split.
That would not work on this one as the tee fitting was broken in half. In my desperation to finish, I looked around for something that might be able to fix it.
I found it: heat shrink tubing.