Hi Tarwetijger,
you're bang on about them bulbs, made by Koito the same people who made the original unit by the looks of it
The only numbers are 110-31672 on the back of the rubber cover and on the glass front of the unit.
As for the bulbs, so far found a manufacturer code on the www. MH6R - 0488, physically the locating tags are in the same
places and are the same size as for a standard H4, the diameter of the mounting plate where the lugs are is 42.2mm on H4
and 29.6mm on the FZR Bulb, filament placement is very different to the H4, the FZR bulb has them mounted parallel to each
other at 27mm and 28mm from the base plate also the 28mm filament is off centre by 2mm (for dipped beam?)
So basically i'm stuck with having to locate and mod some dipping H1 HID's, anyone else got any input on the UK MOT legalities
of using these? someone's got em fitted i'm sure.