Originally Posted by antonye
Yamaha don't make headlights any more than Ducati do.
Yamaha would have given the specifications to a company and they would have made it for them.
Ducati may have contacted the same company and after a bit of discussion decided to use the same headlight - it would be a much cheaper way of doing things. Same for carbs, wheels, disks, brake calipers, brake master cylinders, chains... etc etc!
Do tell the name of the company and preferably the part number as well!!