Amazon.com: SOONHUA Bike Speed Shifter,TX-30 Right Thumb Gear Shifter,1 Pair Mountain Bicycle Gear Shifters 3X7 Speed Shift Lever and Set with Gear Indicator for Road Bike,MTB : Sports & Outdoors
SL-TX30-7R Trigger shifter 7 Gears 21 Speed For Mountain Bike Cycling - Walmart.com
Shimano TOURNEY SL TX30 Shifter 3X6s 3X7s 18 Speed 21 Speed MTB Mountain Bike Bicycle Thumb Gear Shift Lever Set - AliExpress