My center bearing has gone bad with a thumping sound that sounds like it was in the rear. Looked at the car on the rack and all rear end arms were good! So with the car in gear and the engine running could see the drive shaft moving at the center bearing. Ordered the remanufactured shaft from wholesaleimportparts.com that comes with the front and rear guibo. It is the wrong one similar but has raised dowels on one side. Looking at the used guibo and could read the part # 2104110415, this shows up as the guibo for the C300 car.
I have sent a photo the vender, found some big price differences looking at different sites so shop around. Will have to wait until Monday to see what they will do for me.