Since it is a proprietary light, in that it is Sig made and a little late to the weapon light party not many out there. Your best bet would be to call a holster manufacturer and ask about it. A kydex holster maker, leather holster make or Safariland. I am sure Safariland makes a "will fit" holster for it. Most of their duty holsters fit across many makes models and configurations. However, it won't be concealable.
You are in SC, so I am sure there are some kydex holster makes in your state/area. You will probably have to supply your gun and light to them to have a holster pressed. Try Soda City Kydex on facebook, Coastal Custom Kydex or SC Tactical Innovations.
-Dan