Bobcat CT5555 A/C Belt Tightening

Unfortunately, the owners manual that came with my tractor has no information on the Air Conditioning belt tension. After talking with the Service Department at my local dealership it took them a while to find, but they found the correct specs. With 15lbs of pressure at mid span on the longest portion of the belt it should only move 10-12mm or .394-.472in.
I believe it is just a generic belt that they threw on at the factory it has no markings whatsoever on it and I have very little room remaining for adjustment. If someone does happen to have the correct belt size or numbers, I would appreciate it if you'd leave it in the comments.