piece of piss. they dont actually need modified so to speak, they simply need a few little cuts in the bulb area to make the bulb holders fit - 2 minute job if that, simple stanley knife or hacksaw will do. then just cable tie or duck tape the bulb holders in place, you will however need some coloured bulbs and if you feel u need it some reflectors too to stick on the back of ur motor somewhere although i have never had any of them on and i been pulled about summit else and cops never mentioned my lights so personally wouldnt bother
actually, you dont even need the coloured bulbs coz he selling them with too