What source are you using for on line parts? The reason I ask, the dealer I use is in the county where I work, not where I live. And at the end of this month, I retire and it won't be as convenient to get to.
I found Messicks. I have a parts manual and had the part numbers for the o-rings and washers. Messicks didn't have a listing on on of them. But I copied the prices down, and when I went to the Kubota dealer, his price was a tad better! Should have them next week. I'll wait for a warm day to do the leak fix, no point in trying to bleed out everything when it's cold to boot.