Nintendo Wii U Pro Controller ZL and ZR Button Replacement - iFixit Repair Guide
Nintendo Wii U Gamepad controller Black Left Right ZL ZR Trigger Button Parts | eBay
1set=4pcs Original 4 in 1 RL Button L R ZL ZR Buttons for Nintend WiiU Gampad LR ZL ZR Key Set For Wiiu PAD Handle|Replacement Parts & Accessories| - AliExpress
Nintendo Wii U Pro Controller ZL and ZR Button Replacement - iFixit Repair Guide