Bosch, Carrello or Aprillia part number for LHD Pantah H4 Headlamp

Hi All

I’m currently restoring a 1981 600SL Pantah that I imported from Germany. The bike is fitted with a 165mm H4 headlamp with pilot bulb unit from Bosch - part # 0 303 551 101 - that is correct for driving on the right.

I’ve taped over the lens so I can use the headlamp here which is good enough for now, but does anyone know the correct Bosch part # for the equivalent UK, i.e driving on the left, headlamp unit from either Bosch, Carrello or Aprillia headlamp that would have been fitted as standard to a UK bike?

Any help greatly appreciated.