TIMLUB-- That looks almost like the REL driver. The pics on ebay kind of suck, but I will contact the seller. Tonegen made them for NHT, did Madisound make their own and just give it the same number?
ERIK--I actually posted this thread because I too found that BK electronics in the U.K. Problem is they have never written me back. Emailed many times, called and left messages. Looks like they don't want to do business in the USA. At checkout says UK shipping only. Bummer!