Isn't that clip made only for the older MD2 host only? Not sure if it would work in the new MD2 with tail cap.
As for the holster, it's a Blackhawk nylon holster which I bought from Sheares Marketing. I think it has been discontinued. Could not seem to find the exact model in Blackhawk's website. Mine does not have a flap and rides diagonally at about 45 degree to my belt so drawing the light is fast. It has a Velcro strap around the holster for fastening the light in place but I don't bother to tighten it so I could draw the light fast enough. Not secure though if you do a lot of crawling and proning as the light may fall out.