LTAR TMB Lens Barrel Adapter
This component will fit a salvaged lens from a Hasbro/Tiger Lazer Tag LTTO TMB-- either lens from the emitter/sensor assembly will work. When installing this in an LTAR, you will have to open up the existing focus tube and remove the stock emitter lens.
When going to print, choosing cm as your unit should get you the proper scale. If you find it out of scale, make sure you have chosen a metric option, and then you should be able to just scale it by some factor of 10 to get envelope dimensions around 4.5x5x14ish