Dumb question, but given it is polished aluminum that was cut and then rivited together, how hard would it be to make somethign of your own? Maybe it is the socket that is the hard part? I would guess so long as you have a pattern for the indivual surfaces, you could make your own.
that or dont look in a reef place but from someone who used them as plant growing fixtures. jeez, i remember a few years ago, a huge cave system bust where they had like 60+ of the reflectors.