Remove door panel trim (51 42 000).
Align relative heights of front and rear doors with shims.

Loosen hinge attachment bolts and adjust gap between front and rear
doors and rear door and rear side panel.
Desired position: Rear door outer surface should be 1 mm (0.04 in.) lower than
front door outer surface.
Adjust height of door at joint between front and rear doors and between rear door
and window frame where approprivate (51 34 334).
Adjust lock striker plate (51 22 001).