Wolf Tooth Components - Some I-SPEC II shifters are designed to only attach to an I-SPEC II brake. So, if you had an I-SPEC II shifter but no compatible brake, you were
Problem Solvers I-Spec II Shifter / Dropper Remote Bar Clamp | Part # | Worldwide Cyclery
Zrace, Xtr Xt Slx Deore Clamp Band Shifter To I-spec Ev Converter, For Sl-m9100 M8100 M7100 M6100 M5100 M4100 - Bicycle Brake - AliExpress
i-spec II handlebar clamp for shimano shifter | makexyz.com