I had mine go out a few months ago; i took out the whole assembly and took it to an e-brake repair shop (actually, they repair cables for bicycle brakes, wire-acceleration cables, etc...) they might help if there's one of those shops near you.
Else if I'm not mistaken, you'll have to buy the whole assy., which is +$100
2007 GT California Special V8 4.6L 5spd Convertible
~ 3.55 Gears
~ HURST Short Throw Shifter
~ Flowmaster Original 40 Weld in Mufflers
2001 V6 3.8L 5spd Coupe ~ SOLD!