It won't fit a Monster rim as Monsters have a weird continental size lamp.
They only seem to appear on Monsters and old BMW R100 ect.
I do have a cunning plan to make an adapter to covert the Monster to take standard 7" lamp units... What that looks like remains to be seen.
In the mean time I have ordered one of these for evaluation, as it's only a tenner.
http://www.ebay.co.uk/itm/7-inch-Mot...3D162341443978
I will probably bin the reflector and glass from it... There's no pilot light anyway.
The thing is it will open the floodgates to any 7" reflector/lens unit and also choice of bulb fitment, i.e. H4 or whatever or even LED.
That LED unit would probably fit into one of those Jez if you binned the rim that comes with it.