You want cheap and lazy? Well you are gonna cheap quality out of it. Plain and simple. I dont mean to sound like a jerk about it, but its true. You halfass something, you are gonna get halfass quality out of it.

Just get a Metra connector to plug from your new HU to your factory plug, that way, you do NOT have mess with hoping to find the right wires and hope in the ending everything sounds like it did before. Cause once you start cutting wires..........only bad things can come if you dont do it right.

Soche also makes an aftermarket wiring kit as well I am sure for any aftermarket HU to connect to your factory GM plug on your GP.

Do it right the first time.....That's my best advice.