Well if the wiring colors are different just make sure you set it up as straight through.
I have a feeling the plain metra plugs may need to be modified. They do on my Nav, but I'm not 100% sure for the stock unit.
I say spend the extra $$ and get through SVCdc. He's super helpful and his resources like the ae64 website are immensely helpful to all of us, and remember, web hosting isn't free.