wiring for 91 ext cab

when i got my truck the radio wires (among other things) had been cut out. they took the harness and and i have no idea what wires are what other than power and ground. Help!

1990-93 Mazda B2000/B2200 Stereo Wiring

Constant 12V+ Blue/Red
Switched 12V+ Red/Black
Ground n/a
Illumination Blue/White
Dimmer n/a
Antenna Right Front
Front Speakers 4" Dash
Left Front (+) Blue/Red
Left Front (-) Blue/Yellow
Right Front (+) Blue
Right Front (-) Blue/White
Rear Speakers 4" Rear Corners
Left Rear (+) Blue/Red
Left Rear (-) Blue/Green
Right Rear (+) Blue/White
Right Rear (-) Blue/Green

thanks man that worked good. but it seems i cant find a good spot to ground now. I even sanded the holes for the original radio housing on the trans tunnel and tried to ground there...no luck