I realize this is a very old posting...but if you are now reading this old posting, for a new/current broken Bolt/Pin problem:
BAD NEWS: If you break this bolt...the bolt must come from Subaru, anything else is a waste of time..
GOOD NEWS: The bracket (at least on a 1992 & 1994 legacy wagon) is threaded on the top and bottom of this bracket (the bottom is where the broken off bolt thread is still lodged)
Pull the bracket, turn it up end, and with your new Subaru supplied bolt in hand, reassamble.....G.Cody