SHIMANO TOURNEY LEFT THUMB SHIFTER 3 x 7/6-speed (Friction)
Amazon.com: ZUKKA Revoshift 6 Speed Shimano Right Shift Lever SL-RS35-6R Bicycle Twist Shifter Lever Mountain Bike Commuter Bike Folding Bike : Sports & Outdoors
Universal Cycles -- Shimano SL-TX30 Tourney Thumb Shifter Set - 6 Speed [ESLTX30P6FAT]