Stock Unity VR: Oculus detection

Still trying to support both Vive and Rift with plain Unity. Now, the Oculus Touch buttons map differently to the Joystick names (as shown here: https://docs.unity3d.com/Manual/OpenVRControllers.html). Some button IDs (e.g. 0) map to different buttons, e.g. Menu on the Vive and One ("A") on the Rift. This means I have to KNOW if a Rift or a Vive is installed so I can map the keys to the correct in-game actions.

However, I can't seem to figure out how to get that info when...

Stock Unity VR: Oculus detection