I want to wire up my Optipac so that it can switch between Rotary and Trackball with a switch( ie. not with the jumper) and I can't find what kind of connector will fit on it.  I looked at some HDD power cables but they looked too big to fit over the wires.  
Specifically they are the 6 pins, 3 on top, 3 on bottom, that I'm trying to connect to.  
And I don't want to solder to them.
Thanks.