I also had no success in finding the correct paint at any of the big box stores, nor at the paint store. As you probably know, Kubota changed their orange paint in the last couple of years. The old orange is simply called 'Kubota Orange'. The new color is 'Kubuta Bright Orange'. And they are definitely different in shades of orange. The local TSC store had plenty of the older Kubota Orange, but no Kubota Bright Orange.
So, I started to order a quart of the new Kubota Bright Orange at the Kubota dealer and discovered that it was $38/quart! I passed on that, buying only 1 spray can of it for a measly $11/can.
I took the spray can directly to Sherwin Williams paint store to order a quart or two. After numerous attemps to match the color and content, they gave up. Said they simply COULD NOT blend a match. I inspected each batch that they came up with, and certainly agree that they couldn't.
Perhaps Kubota is trying to pull in all parts and supplies back in the distributors, for whatever reason...