99 Silverado Z71 stereo wiring colors

I want to put a new Alpine head unit into my truck. The factory unit just doesn't cut it. Does anyone know where I can find the OEM wire colors for free, if possible?

do a search on here for radio wiring or audio and i am sure you will find them. i have posted them a few times.

if you stil have the factory plug and are putting in a radio go buy a harnesss and save yourself the headache. heres the colors

LF+ light brown
LF- light grey

RF+ light green
RF- green

LR+ brown
LR- yellow

RR+ blue
RR- light blue

Just for the hell of it,

12v constant - orange
12v switched - green
illumination - gray
ground - black

Thanks. I appreciate the help.