I gave you a diagram in the linked information. It also matches the routing in your post above.
In one of the pictures I can see the alternate pulley mounting point just behind the AC muffler. That's would be where the ribbed pulley would go. A smooth pulley would go in the current ribbed pulley location.
GATES 38006
I don't know what else I can tell you. Either get the shorter belt or add the extra pulley. Ford makes slight changes all the time for various reasons. I suspect the changed routing was done to improve contact area around the alternator pulley. Further it happens all the time where the database has part errors.
I have even had parts stores send the wrong part. I have even had it happen where the label on the outside match the correct part but there was a different part on the inside of the box.
Another possibility. Does your car have under drive pulleys? If so this might be a clue to the mystery why it is not fitting.
Or go to your local autoparts store and have the current belt measured. Try a shorter size.