GameCube Controller Shell for WiiU - The Nintendo Gamecube Wavebird Controller is what inspired the creation of the GameCube Controller Shell for use with the Wii remote, sadly Nintendo had to cease
Amazon.com: eXtremeRate White Faceplate Backplate for Nintendo Gamecube Controller, Soft Touch Grip Replacement Housing Shell Cover with Buttons for Nintendo Gamecube Controller - Controller NOT Included : Video Games
File:The Remains of the Nintendo GameCube Controller Ports and Memory Card Slots in the Wii Family Edition.jpg - Wikimedia Commons
Finished my custom controller. new shell (it's a Wii u smash controller originally), paracord cable,new tactile (clicky) z button, and LED's controlled by a hidden touch switch. : r/Gamecube
Gamcecube Controller NGC White on White Gamepad for Gamecube - Etsy Denmark
Request] GameCube controller mod to enable use on home screen to select channels or to start game disk : r/WiiHacks
Amazon.com: FIOTOK Gamecube Controller, Classic Wired Controller for Wii Nintendo Gamecube (Black) : Video Games
Amazon.com: HORI Battle Pad for Wii U (Luigi Version) with Turbo - Nintendo Wii U : Video Games
GameCube controller - Wikipedia
The GameCube Controller Adapter for Wii U Should Open Some Doors - Talking Point | Nintendo Life
Nintendo Support: How to Use Nintendo GameCube Controllers
GameCube Controller for Nintendo Wii and GameCube [2 Packs]
How to Use a Gamecube Controller on a Wii: 5 Steps (with Pictures)