Sounds like quite a conundrum.
Car Radio Battery Constant 12v+ Wire: Green/Black
Car Radio Accessory Switched 12v+ Wire: Black/Pink
Car Radio Ground Wire: Black/Green
Car Radio Illumination Wire: N/A
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Orange/Green
Left Front Speaker Negative Wire (-): Blue/White
Right Front Speaker Positive Wire (+): Tan/Green
Right Front Speaker Negative Wire (-): Green/Orange
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Gray/Blue
Left Rear Speaker Negative Wire (-): Brown/Yellow
Right Rear Speaker Positive Wire (+): Black/Violet
Right Rear Speaker Negative Wire (-): Orange/Violet