The mudflaps are so small I wouldnt bother colour coding them, they are flexable, so unless they are painted with the proper flex paints, its pointless.....
It took me about 5 minutes a corner to fit them, you just remove the Torx screws that hold the arch liner, fit the flap & use those holes to fix them in place with the longer screws supplied.
I used a socket & didnt even have to remove the wheels, its tight, but possible