I also have 1 for sale Super Pro AVi kit with TWO headsets. Tested on the bike but never installed. Couple of years old no intructions.
Also included.....
Part 1179 7 pin extention lead
Part 2091 Headset loom with white and red sockets and 3.5mm socket for in ear speakers
Also a Interide headset that plugs into the autocom wiring. Tired it in the house but never got outside.
http://www.intaride.com/integra_no_purch.html I dont have the other bits to help them fit in your ears.
Everything for £80 including postage.