I had to git two pairs of lights since the design changed from last year (fer the better) as everything is sealed up in the current design. I did notice that the red lens did fade significantly from the previous version compared to the current version. Here's a quick mockup of one light set that the lens has been mounted in 1/2" thick Foamular.
Vertical lights...
Horizontal lights...which can be also centered on the rear bulkhead.