Not quite the answer that you're looking for, but....
Have you looked on Ebay for the lights that kingofsoles sells?
He has some Quark AA heads that I can see, and he may also have the bodies and tails. It's worth messaging him as he's an ex Foursevens emplotee, as far as I know, and is very helpful.
Search om Ebay for "Quark head" and then find kingofsoles stuff.