Easy, go to www.dsmclub.com do a seach for parts cars or as I did do a search for "gsx calipers" worked perfectly. I found a guy taht had a parts car and sent him an email asking about some front brakes. Make sure you check the date of the guys post so your not emailing someon from two years ago. You can also search under your local dsm club through that site too and possibly find someone in your area and save on shipping and even get them installed that day.
I'm searching now for some cheaper cross-drilled and slotted rotors for a gsx and stainless lines since I'm gonna have to belled the system anyways. I don't want to have to bleed it again in a few months when I get more money.
PM me if you have more questions. I can help you find some. I also might be picking up some of those 'ford' injectors so i might have a few extras.
Fully Built MS powered 99' GS Sport, Garrett T3/T04e 60 trim with one big ass intercooler!