I agree that the original Kubota Belts are the only way to go. I use the Messick Dealer online and get such items mail order. I avoid my NAPA dealer for belts.
What size deck is yours and type engine?
I have a older late 90's Kubota 1770 with a Kohler and 48 inch 3 blade deck.
I am curious how yours differs from mine and if you have had any other maintenance issues?
I am in the middle of changing all belts, blades and checking the spindle bearings.
I am very happy with the mower that I have mainted since new. I give it very had use in our orchard.
Like to hear from you.
jamesu in No. CA
