Ken Victrix with Gen 2 Sanwa silent buttons and a Link EX Groove : r/fightsticks
This stick has been sitting in my climate controlled storage with a dust cover over the top and these white OBSFE silent Sanwa buttons still yellowed. : r/fightsticks
SANWA OBSFE-30 PUSH BUTTON available at videogamesnewyork, vgny
Joystick Parts - Sanwa OBSF-30 Pushbuttons: Focus Attack