PAC makes a few SWC interfaces, but I don't the app guide very well.
Quote:
#513820: 2008 FORD F150 2DR TRUCK WITH 4.2L ENGINE AND STANDARD AUDIO SYSTEM
Audio/Mobile Video
WIRE COLOR POLARITY LOCATION
Battery LIGHT GREEN/VIOLET (+) RADIO HARNESS
Accesory LIGHT GREEN/YELLOW (+) RADIO HARNESS
WILL BE PINK/BLACK ON XL AND STX MODELS.
Ground BLACK (-) RADIO HARNESS
Illumination LIGHT BLUE/RED (+) RADIO HARNESS
LF Speaker (+) ORANGE/LIGHT GREEN
LF Speaker (-) LIGHT BLUE/WHITE
RF Speaker (+) WHITE/LIGHT GREEN
RF Speaker (-) DARK GREEN/ORANGE
LR Speaker (+) GRAY/LIGHT BLUE
LR Speaker (-) TAN/YELLOW
RR Speaker (+) ORANGE/RED
RR Speaker (-) BROWN/PINK
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The tech sheet should get you pretty close. If you need VSS, I believe ford commonly uses blk/pnk somewhere near the radio.