Comes as just the light unit and it fits straight into the OEM cowl . It plugs into the 4 pin headlight socket so no modifications or changes to anything required . I got it from the CoxComb Racing Store £122 delivered
OTOH if you do 2-up tours across Europe maybe it ain't such a great idea.
No way I would take anything bigger than a 701 / 690 Enduro properly offroad - I don't mean the well graded unpaved passes you get in the Alps which I have ridden 2-up on a ZZR1400, but real mud / ruts, wet grass or chalk / rocks / roots / rivers.