Thank you,
although it wasn't exactly the same connection,
it gave me some good insight to back up my educated guess.

Well, I found a 10-pin connector in my drawer at work,
so I got out the soldering iron and the multi-meter
and gave my idea a try,

I split the red speaker wire to pins 5 & 6
and the yellow speaker wire to pins 9 & 10
I had to attach them to both for the rear audio to work.

And I put both grounds into pin 2

The sound works perfectly,
unfortuantley you need powered speaker in the rear
as they won't disable if you plug headphones in the front.

I attached the red mic wire to pin 1
and the yellow to pin 3

I haven't tested the mic yet,
as I'm a little leary of cooking it.

Will it wreck the mic if I got the mic and micpower reversed?