After much futile searching, I finally found a current, modern Horse Collar BCD to use with my fabulous Sea Hunt twin tank harness provided by Allan Klauda. BC-002 (marketing name Aquatec) is made by Duton Industries (Taiwan) and appears to be very rugged and high quality. It's a little pricey, I paid $220 plus $35 shipping. If interested, here is link.
http://www.scuba-aquatec.com/pro_show8464.html?PID=65