Harmony 2013 Belt Issues

I was given a Harmony 2013, I got it running and mowed the yard today. All was good until I was almost done I disengaged the PTO and the belt threw all the tension around the engine pulley and the belt fell through the peg that is supposed to hold it on. I put it back on and it did it again. I'm thinking just adjust the belt tensioner and replace the belt since it is dry rotted. I have looked around on the internet and can't find a part number for the Deck Belt. Does anyone know the part number for the deck belt?
Thanks and advice will be greatly appreciated.

If you post the mowers model number someone should be able to find what you need.

What exactly do you mean by model numbers? I have the serial number I thought it was just a 5-Speed Harmony 2013. The Serial Number is MZBF 6014475

https://www.hondapartsnation.com/oemparts/l/hpe/505ce81df870022d24be0400/h2013-sac-parts

https://www.google.com/search?q=dec...ome..69i57.74007j0j4&sourceid=chrome&ie=UTF-8

Mechanic Mark, Thanks found just what I needed.