Shifter Bar Clamp Adapter For Shimano I Spec B Left/Right Shifter – Dcbikes
I-spec B Handlebar Clamp 22.2mm/31.8mm for Shimano Shifter - Etsy
Buy Generic Handlebar Clamp Adapter for Shimano I-Spec B Style Shifter Online at Lowest Price in Saint Helena, Ascension and Tristan da Cunha. B08L42SMHC
Shimano I-Spec bar clamp adapters - do they exist? : r/bikewrench
KCNC Lever Clamp for Shimano XTR/XT M-9000/M8000 I-Spec II Shifters (1 pair)