J05a is the upgraded version of J03A. These pads will fit Shimano XT XTR ULTEGRA as below Set of 4 pads for front or rear.
2Pair Shimano J05A-RF Resin Compound Disc Brake Pads - With Cooling Fins Cycle
2Pair Shimano J04C Metal Disc Brake Pads ICE TECHNOLOGIES w/Spring New
Shimano J05A-RF Disc Brake Pads Resin w/Cooling Fins Y2R298020 1x Pair
Shimano J05A Resin Pads for XTR/XT/SLX/ALFINE
