radio 2003

what's up with this damm harness?
I just wanted to install a new cd player but it doesn't take a regular connector it has to have a 75 dollar one. Can anyone tell me the color code for the harness from the factory and can i just connect the power and ignition etc without the chimes? there's like 3 orange wires that have different sizes. I don't know where to get the color code to connect it myself. Please help

this is for the 2003 silveraldo

i work at a shop and you dont have to use that piece. i know circuit city has a met 802003 for like 17 and best buy has a met 702003 for like 18. they are the same harness and will both work. they also make a piece to keep the chime but not needed, part is bewteen 75 - 90 bucks