yeah im trying to find one man if i do ill let you know but i been looking for 2 mths now, so i reckon i may give it a shot and try to knock up a box ( fithy minded buggers)myself.
building something at the moment hey mate, currently making one at the moment, will post pics hopefully on saturday when its finished. at the moment its just fibreglass. it sits in the right corner of a 2+2, moulded to the shape of the boot, it just sits there, don't need screws or anything to hold it in (though there will be of course). it holds a 12" sub suited for 0.85cu ft enclosure. will send you pics soon!
99% of audio places do this.. ie the place you buy subs from also do installs.. and fibreglass is one of their staples