>>309364376
there's basically two routes for FBT- vive trackers and kinect. Kinect sucks bad and nobody sticks with it for long. Vive trackers can be used with any pc headset that works in steam vr, but they also require steam vr basestations.

You have an index, so you already have basestations. Buy 3x vive trackers and make sure you've got 3 spare usb ports for the dongles and that's all it, you've got fbt. Attach them onto some old shoes/belt, maybe buy some small usb powerbanks if you plan to use them for more than 3 hours.

If you're buying used trackers for some reason, make sure you get the V2 trackers (blue triangle) because the V1 trackers don't work with V2 (index) basestations.