roguemotorsports
www.roguemotorsport.co.uk do a "rev 6 low rise quad headlight conversion kit", $795 landed from UK - I tried to order one just this week but they're out of stock of one of the fixings that comes with the kit - apparently the manufacturer has stopped making them, so they are looking for a new supplier.
Twosrus
www.twosrus.com stock the same rig but for $495 US, plus postage of course. If you can get them I'll have one, am currently on roguemotorsports waiting list but will cancel if you can get hold of them.