It fits completely inside the tailshaft cone and is covered by the seal. I've never seen one come out, and can't imagine how yours came out without damaging the entire tailshaft housing.
I've got a whole bunch of tailhshaft housings here from SYE installs, would be glad to send you one with the used bushing installed, for the cost of shipping.
Check with jeepers in your area, chances are there are some around leftover from SYE installs.