Hey hey,
If anyone is doing their own speaker install (like I just did), this info might help. Here are the color codes for your speaker wires:
LEFT FRONT (POS): ORANGE W/ GREEN STRIPE
LEFT FRONT (NEG): LT BLUE W/ WHITE STRIPE
RIGHT FRONT (POS): TAN W/ GREEN STRIPE
RIGHT FRONT (NEG): GREEN W/ ORANGE STRIPE
LEFT REAR (POS): GREY W/ LT BLUE STRIPE
LEFT REAR (NEG): BROWN W/ YELLOW STRIPE
RIGHT REAR (POS): BLACK W/ PURPLE STRIPE
RIGHT REAR (NEG): ORANGE W/ MAROON STRIPE
HERE'S THE LINK TO THE ONLINE DIAGRAM AT INSTALL DOCTOR:
http://www.installdr.com/Harnesses/Ford-Wiring.pdf