I bought them from Banggood years ago and split them with another member. The LED units unscrewed (fan separated from body), which was great for fitting - I don't know if they are still available.
HID IIRC was a 55w - the ballast fitted under the clocks behind the fairing - loads of dry space there.
I'd go LED as they are plug n play, save power for other goodies, start immediately, are whiter/brighter than HID and last well.
The lamps linked below are fitted to my 900 - the metal mounting plate can be positioned to give an accurate focal length - I did have to make some 8mm thick spacers to allow the retaining clip to hold the lamp in place.
https://www.banggood...ur_warehouse=CN
You may be tempted........by the price and limited faff.
EDIT had a looksee and thete's plenty of H1, H3 etc available for less than the price of walletbreakers
And then the fighting started.........
Edited by Favs, 23 September 2019 - 12:31 pm.