I concur with dedwards.
I think you have got your steering out of balance left to right when you installed the new steering piece on the front. When you get your car to a decent alignment shop TELL them what you have recently installed on the front. As the Crossfire came from the factory the only alignment adjustment in the front or the rear was toe. There are adjustable bolts available from several sources which replace the OEM bolts on the lower control arm to give you some adjustment to the camber and caster on the front. Those adjustable bolts will have a washer on them that is cut on a side so they do not look round like an O. Those are visible when looking at the front lower control arm. There are also available adjustable bushings, but again those are after market items. DO NOT mess with the steering wheel until you are certain ALL the steering links on the front are correctly adjusted and balanced as to left and right. When the shop has that completed they will center the steering wheel and adjust the toe.
The rear also has after market bolts or bushing available that will allow adjustment to the camber. As the Crossfire came from the factory only toe is adjustable in the rear.
It is possible to remove the steering wheel and physically move it in relationship to the steering column, but that really should not be necessary if everything under the car is correct and no one has had the steering wheel off in the past for some other repair.
PS. NEVER, NEVER!!! loosen the lower control arm bolts by twisting the head of the bolt! Loosen those bolts ONLY by twisting the nut. It is the only safe way to get those bolts loosened.
PPS A good shop familiar with Mercedes will also increase the caster by about one degree on the right front hand side (If the caster is adjustable!) to allow for the crown of the road.