Installation is simple, it'* just a couple small hex-head screws holding the corner lamps in...if you're talking about MAKING them, it'* a little more difficult. They have clear corners on ebay (right now I think they are out of stock), or you can make your own by taking them apart and pulling the orange reflector out and sealing them back up.
If you find any on ebay, there is a clear reflector in place of the orange on yours. If you make them, you won't have any reflector piece in there and you will actually see the bulb. I'd go with the common clear 194 for the bulb that'* amber when lit, but clear when not lit. You can do any color you want, but I'd stay legal.