Your in Canada aren't you, in the US Kubota offers discounted ROPS units, its the law.
I don't think there is a P/N for the ROPS, there will probably be a whole goods number for it, you'll need to go through sales to have them look up the number.
Yes i am in canada. I am tempted to call someone in the states and order it up. I will try to convince my local dealer to call someone in the usa if they cannot figure it out.
The ROPS program doesn't apply in Canada. You can still get the ROPS, but you will pay about twice as much. If you are near the 49th parallel, like myself, go see your closest American dealer and order it from them. More than $200 difference.