1998 Expedition Window wiring

The online database tells me the window up and window down wire colors for Right Frnt, Right rear, LF, LR. However, it doesnt state where you might find this entire group of wires in one location to easily tie into. Also, the 4 window roll up module that I have actually tells you to install it by physically "cutting" the wire from the switch to the motor and splice it into it. The LF wires from the module has a "to switch" wire, and a "to motor" wire (I asume that it allows power to flow freely though it so that the original switches still function).  Can someone please tell me where I might find a harness that has both up/down LF-LR/RF-RR in a convient location to splice into the "up" wires...

Thanks

I should also mention, that I understand I can hit it at the master control switch in the door, but am asking if anyone knows a convient location under the dash, can someone verify that it runs further than from the door to immediatly into the passenger compartment fush box, is there ample wire to cut at this location, etc, et.c..