Hi Im using a GTS CEV headlight unit on my Darmah and wondered what size replacement lamp unit I can fit ,present one is useless 
I have not had a look if it is there but try the websites interchangability list
Give John Fallon a ring at Mdina Italia, he’ll know what’s available now.
I fitted a Cibie Z beam unit into my 900SS over 25 years ago, it still works fine.
Steve Robins
Could be a slightly difficult one this, as if memory serves me correctly, the Darmah had an 8" headlight, whereas most other bikes of the period had 7" jobs, so there may not be a lot of choice.
@Spaggy its a 900GTS headlight unit ,most of my darmah front end was from my old GTS. Was why I asked here and not in desmo twin forum .
Just found a 7" wipac quadoptic unit from vehicle-wiring-products.eu fits great and very cheap £25 
They have a lot of electrical and other stuff suitable for bikes.