GENUINE LUCAS 7" HEADLIGHT Lens Reflector 516801 553921 Norton Triumph BSA 650 750 850 Moto Guzzi Electrical and most OIF

and most OIF

Both rod and nut are 1/4" x 28tpi

and should install with no other changes necessary

Honda had 2 part numbers for the diffuser

Suitable for all Commando with hydraulic front brake except MK3

GENUINE LUCAS 7" HEADLIGHT Lens Reflector 516801 553921 Norton Triumph BSA 650 750 850 Moto Guzzi Electrical and most OIFNote that there is no pilot parking light on this unit. (Like you ever used it anyway) Genuine Lucas, imported from Britain. As fitted to many British motorcycles with the large 7" headlight. The real deal, 'Lucas' cast into the glass. New Lucas number 553921, fundamentally the same as old number 516801.