G*^#%*@**#&(*# bloody *%&*(()$$@# computers! I just wrote a reply but my login expired while I was writing it, so when I went to post it it was destroyed

The problem with the old backing plate was the stud that holds the tensioner on. By the time I got the nut off, several threads from the stud had come with it. However, I was able to reuse it. The stud from the new backing plate could not be used on the old backing plate.
The belt seemed to fit fine with the markings? Maybe if I looked more carefully on the old one, but the markings looked like they had been rubbed off.
It is a bit more than halfway back together now. Still need to reinstall the intake plenum and the inlet pipes. Taken a lot longer than I thought, so working somewhat in the dark now. I am reasonably good with a wrench, but I am also careful. It has been over 5 hrs so far, with 1 more to go. One hour was lost due to the wrong parts. That is not including the 1.5 hrs spent getting set up and flushing the coolant. My back is KILLING me, so taking a break for a while. Not going to get any darker.