ISEV-MM is for a Shimano I-SPEC EV shifter mounting to a SRAM MatchMaker brakeMM-MAG is for a SRAM MatchMaker shifter mounting to a Magura brakeMM-ISEV is for a SRAM MatchMaker shifter mounting to a Shimano I-SPEC EV brakeCompatibility:-Designed to work with rear (right side) brakes and shifters.-Consult the brake and shifter manufacturers to under..