Thanks everyone for the suggestions/comments. I decided to not send the HU back, and just give it a try. I really want the features of new HU, especially the remote, as I have my seat all the back, and the station tuning button on the stock HU is on the far right. I don't listen at high levels so until I replace the speakers, it might survive the impedance mismatch.
I do have to figure out how to remove the window crank from the door panels. Don't laugh, it's a basic truck that has crank windows, and the millennial anti-theft devise option::smile::