I'm in contact right now with Clint from TiC (turn-in concepts). They make this specific bushing (and a whole bunch of other ones) for subaru's...I had one in my last car.
I sent him pics and measurements of everything, and he's gonna get back to me and see if we can modify (sand, cut, etc) one of his existing bushings to fit the B13 shifter.
Still kinda surprised that no one makes these anymore.