if you want a blue one but can only obtain black, it's not too hard to change it yourself with a small piece of matching MB-tex. the trick is to use something strong but thin, like a pen knife whose blade isn't too valuable to you, and pry up the little tabs that hold the outer chrome edge from the inside chrome bottom. then replace the vinyl insert with a little foam padding and the blue tex.
Rick
Dallas TX
1967 250SL, 4-speed