Front Door Striker: Service and Repair
51 21 003 Replacing Door Detent (Lock Striker), Front Left Or Right (Z3 Roadster, M Roadster, Z3 Coupe, M Coupe)
Remove rear side trim (lower section).
Lift off cover (1). Unfasten connector (2) and withdraw cable.
Unfasten screws (1) then remove threaded plate (2) and striker (3)
Installation:
Adjust striker.