Shimano Bike Parts Tourney Tx50 Thumb Shifter Gear Lever 3 6 7 18 21 Speed Shift MTB for Mountain Bike Thumb Shifter Plus - China Shimano Bike Parts, Brake | Made-in-China.com
Amazon.com: Kopi Shimano Tourney SL-TX50 Compatible Thumb Gear Shifters 7 Speed Right Shift Lever 22.2mm : Sports & Outdoors