Tyrone, there is also the german guys who make the units I believe who are very helpful. I recently installed wing tip, landing and strobe lights to a customers MB339 (there is a build thread here) and they are really very good. You can order plastic lenses for the lights in all sorts of shape and size as well.

[link]http://www.flugmodellbau.de[/link]

Here's a pic of the finished wing tip installation..