Yes they can be changed by themselves with relative ease.

How many miles are on your crossfire ?

Before you order I would check the play in the bearing.
The u joint in the middle of the 2 piece shaft is non rebuildable.
Some change the flex discs and bearing and have to keep the joint, some just get a whole new shaft.
The bearings and flex discs are available, the problem is the pinned in u joint and no body has the tool to change a mercedes u joint.

I went a different route.