HOWTO - Atari 7800 Controller ST Compatibility Modification - ctrl.alt.rees
One dual Red Button Joystick Controller for Atari 2600, Atari 7800, and Atari Flashback Systems - Walmart.com
Repairing Atari 2600 Original Wireless Controllers « modelrail.otenko
RISE-2X Gaming Joystick Controller For Atari 2600 Game Rocker With 4-Way Lever And Single Action Button Retro Gamepad - AliExpress Consumer Electronics