I've got a friend that just upgraded his WRX brakes and is willing to sell me his stockers + StopTech SS lines to go on my 99 2.5rs. Anyone know if this will work?

I can't really see why they wouldn't fit, but it never hurts to check first.

There is a thread on scoobymods about a RS to WRX brake conversion but it's not clear whether the lines will fit up perfectly (StopTech does have different model numbers for GC8 and GDA) or what.