Shimano Deore SL-M4100-R Right Shift Lever - 10-Speed, RapidFire Plus, – Windrock Bike Park
Found: Internal hack to convert SRAM MTB 10 speed to 11, without replacing shifter or rear derailleur - Bikerumor
Mountain Bike 10 Speed Groupset 10s 11-42/46/50T K7 Cassette Shifter Rear Derailleur X10 Chain MTB 4 Kits For Parts x5 x7 m610 - AliExpress
Amazon.com: LITEONE Mountain Bike Shifter Bike Gear Shift Lever 10 Speed Bicycle Trigger Shift 3X10 Thumb Gear Shifter Cable Compatible for MTB BMX Road Bike Folding Cycling (Right and Left 1 Pair) :