Your dimensions are correct. Unfortunately AGCO has been ordering belts that are 1.0625" wide with an incorrect forty degree angle, from suppliers, for several years. This has caused all the belt companies to change their books. to some very wrong belts. They are using an old blueprint that has been drawn wrong. I have that original MM print and mine was factory marked up as being incorrect. I also have come across several copies of this same print that were never marked up, or destroyed.
Gates/NAPA also totally screwed up their MM belt section about the time Gates renumbered their product line. No one ever sent out a cross from old to new numbers. The correct NAPA number belt for a U is 25-30467. Before 1980 they called it 25-11850. I still have a few NOS belts that are marked with the old number and have the new number on the sleeve. Gates, Dayco, and the rest also forgot to check the pulley angle.
Bless their little tin hearts.