All my tanks are Taigens upgraded with Clark boards and the mounts made with the styrene tubing will give you the required 9mm depth and an opening that is less than 6mm. The IR emitter is kept in the tube with friction fitting as the inner diameter of the 1/4" tubing is slightly smaller than the diameter of the IR LED. If it ever burns out I can easily pull it out for replacement. I did some range testing outside in bright sunlight in my backyard and I was able to give and receive hits at 60 feet. The range was limited by the length of my yard. Hopefully this weekend I'll have time to test the maximum range somewhere else.

The mount is easily made and I have used it in Taigen's KV-1, T34/85, early and late model Tiger I, Panther G, and Panzer IV. The only issue I ran into is the muzzle brake on the Panzer IV causes a shadow to the right of the point of aim.