Take off front ornamental grille, cf. 51 13 010.
Loosen screws on headlight and remove.
Pull out plug.
Note when assembling: Fit headlight insert into recesses
in holder frame.

Important:
By using flat diffusing lenses the road ahead can be
illuminated even better.
The diffusing lenses used so far were curved.
It is recommendable to fit on the new diffusing lenses
two at a time (i.e in pairs).