Modified these two HTC Vive tracker mounts for my purposes.

Vive Tracker Limb Mount: enlarged strap holes to fit 1 inch Velcro cinch straps and reverted to original design that uses a M4 screw for the stabilizing pin

Belt loop: modified to allow a more rigid belt to slip through

Parts: Velcro straps: https://www.amazon.com/gp/product/B000TGX0HK/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=poptartingcom-20&creative=9325&linkCode=as2&creativeASIN=B000TGX0HK&linkId=23a2f61d3e3038aee5606c64a3886cef (affiliate link) M4-0.7 x 8mm screws: https://www.homedepot.com/p/Everbilt-M4-0-7-x-8-mm-Phillips-Pan-Head-Machine-Screws-2-Pack-12278/203540102 1/4"-20 x 1/2" hex bolts: https://www.homedepot.com/p/Everbilt-1-4-in-20-x-1-2-in-Stainless-Steel-Hex-Bolt-5-Pack-812190/302007774 5/16" washers: https://www.homedepot.com/p/Everbilt-5-16-in-Stainless-Steel-Flat-Washer-5-Pack-800351/204276463