Steam Community :: Guide :: Rebinding "Legacy" games for new controllers
Steam Controller, SteamVR, Steam Machines: Valve's hardware push in photos | Ars Technica
VALVE INDEX controller - LEFT only Knuckles for PC steam VR games HTC VIVE pro | eBay
Valve Brings Custom Keybinding to SteamVR, Letting VR Apps Support All Compatible Controllers – Road to VR
Joystick Controller Mod for HTC VIVE Steam VR Virtual - Etsy
Amazon.com: HP Reverb G2 VR Headset with Controller, Adjustable Lenses & Speakers from Valve, 2160 x 2160 LCD Panels, for Gaming, Ergonomic Design, 4 Cameras, Compatible with SteamVR & Windows Mixed Reality :