I'm not sure if I have exactly what you're talking about, but I do have the black fork sliders on my bike. Click the pic below and there should be a couple of decent shots of them. I like the way they set off the wheels.
I have the black fork sliders and too find it set's off the chrome wheel nicely. Had considered the black tree but than decided it broke up the chrome in that area a bit too much or not enough, just didn't think it worked all that well. So I went for the black hand levers, black mirrors, black top and bottom sort of thing