Glad you found it.
With VIN and PIN numbers it is always a zero "0".
Here is a parts diagram:
Parts lookup and repair parts diagrams for outdoor equipment like Toro mowers, Cub Cadet tractors, Husqvarna chainsaws, Echo trimmers, Briggs engines, etc.
www.partstree.com
These can be interesting to put a drive belt on. Be sure the cooling fans on each drive motor is good and be sure to replace the tensioner idler for the drive belt. Just doing the belt, will be practice for going back and doing the pulley in a very short time. (likely with another new belt)
You will have to raise the rear of the machine, then remove the wheels for access.
If you are not mechanically inclined and have the tools, then I suggest a reputable shop or a competent mechanic who knows there way around riders and zero turn equipment.
Cub Cadet does not show a drive belt replacement procedure that I could find. The owner's manual only shows deck belt replacement. Maybe someone else has the drive belt replacement information here on the site.
Best of luck