Help from long term Vive devs please!

I’ve got a 4.7 project which has some modifications to the viewport renderer source code. Being a massive lamer I can’t make those changes work in later builds. Does anyone recall how to get the ‘Beta V 1.0’ Steam VR plugin to actually work? All I actually need (for my purposes) is to stream in the location vector of one of the hand controllers. I can’t find any of the blueprint nodes at all!

Thanks for any help!

FYI - the project allows me to offset the projection matrix based on X,Y,Z coordinates, which I want to be able to alter at runtime based on the position of the controller - which I may or may not strap to my head!