the one on my pulsar is square ish, i removed the glass, and made a mould from there i made a modified the mould and made the vent.
at the moment its just a grp shell that bonds directly onto the back of the origanal headlight.
then i cut away all the palstic on the rear leavin the mounting points so its oem fitment. with sunny headlights bin on ebay ofr a a fiver its a cheap mod which looks so agressive. and with morretes holding there money still its a good option for track and drag. plus its legal during the day!!
dug around and only got drivers side. so im on the look out for a really cheap headlight.
ill get some pics on that iv just taken