Naked headlight bulb

What type of bulb does the naked 2008 model has???
I'm about to order the Osram Night Racer and i don't know if i need the H7 or the H4 bulbs
I just can't find it anywhere written on the manual

H4

<IGNORE THIS BIT> Talking drivel to get characters to minimum </IGNORE THIS BIT>

i fitted the nightbreaker and its a vast improvement on stock, get 2 though because they are not meant to last that long