Here is the parts they offer to rebuild the caliper:
130-10540 crossover o-ring
130-2655 o-ring kit
200-3479 piston
120-3482 complete caliper.
F.Y.I. It is about half the price for parts plus shipping of a new caliper. Sometimes it is better to just get the complete new one. Just some options for everybody.
Wilwood---(805)388-1188
http://www.wilwood.com/
