not knowing your location....you mentioned going to Mississippi.

try:

All-Go Auto Parts
City, State: Starkville, Mississippi
Local Phone: 662-323-5342

Salvage Yard Locator

i cannot find a junk yard around where i live or in mississippi that has this if anyone can find a 03-05 in a junkyard i would greatly appreciate it

Did the car originally have a monsoon or bose system? If it is monsoon like mine, I could read you off the wiring as it is in my car. I'm putting in an after market radio soon and I had to get a special module that comes with a speaker for the door chimes, and plugs directly into that plug you are missing. You could rewire an aftermarket radio then once you know which wire is which. If it'* not monsoon or bose, I would set aside your powered wires, (remote, power, ground) Should be red, yellow, and black, but not always. Then take your speaker wires and pop them with a battery by connecting the negative wire to the negative side, and the posative to the posative. I would use a 1.5V battery. That would let you know which wire set goes to which speaker.

I would try the battery thing but right now i have around 20 wires hanging out the dash is there an easier way to do it

alright i finally found a place that has a 03 bonneville and they have the part i need but its in Oregon and im in Mississippi. Is there anyone close to albany oregon that can go pick up the part for me and ship and i will send them the money for the part and throw in a little extra for the help.