It looks like Bendix made a hardened version of the 26Z5W numbered RXB-103379. Ok, don't laugh at my bid, but I grabbed a pair off of Ebay: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5748382448 Anyone ever see these before, or know why the military needed a hardened variant? Were these ever used in R390A's? - Gary KB1FBI