I'm looking everywhere for a pair (02-S4)
I think they were DP. It's not a problem, really. I don't mean that it "shakes" as much as a slight vibration that makes the headlight seem to flicker when you see it coming at you.I have some on "thick pre-preg CF" light holders on my M944, no shaking problems at all. I guess it really depends on who makes them.
Sean and Nunez have them on their bikes as well. No problems on their bikes either.