Well, bad news. I received the part#280981EA0A (display harness) as stated in my previous post. Sadly, it's not the large harness I was hoping it would be. Instead, it's a single, small, brown, and square connector for one single point of connection as shown in the far right side of the picture in my original post of the back of the receiver.
Not really sure what to do at this point; certainly open to suggestions. If anyone wants to take on this project, I'll make you a good deal on the package including the additional harness and GPS antenna I've bought.