I don,t know about other Mac models, but I do know about my 26D. Apparently, one can purchase plexiglas with UV protection, but it costs more. So guess what, we got the plexiglas that changes color with time. I have replaced the drop board in the entry way on my boat. It allows a bit of privacy from dockwalkers. When I get done with my starboard portlight installation and window area increase (opening window in the head), I am finally gonna get rid of the pink plastic windows at the other three windows. I was thinking that I'd open up the holes a little bit while I'm at it. Even if I had to make a frame for the window hole to support the deck, it would be great to let in more light. John S