there are ONLY three (3 or 4) Mercedes that use the pumpkin that the crossfire used,, slk 320 slk32, c32 and I don't know as for the spline and hub there are 4 or 5 the three above and I don't know.
I have ask Rudy also and he said there are none that fit the crossfire, he looked a year or so ago, when the guy in Texas was racing and broke an axle, and needed one to complete the race