The problem with GSR trannies (I know, I have the same thing going on right now) is that Honda won't sell just the synchro and you can't get JUST the synchros. You have to buy the whole shaft at $500/each (there's 2 of them in there = $1K). I know a guy that sells JDM ITR trannies for $1250 shipped.... I suggest you go that way if you have the $$$.

If you do find a place that sells the synchros, lemme know. I need a set too.