They do break down the parts but all you'll see are Kubota part numbers, no aftermarket part numbers.
Mine's a B2714C with the 70060-04541 fixed length driveline
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For the u-joints, I ordered the AC Delco from Rockauto.com for $12 ea + shipping. I need a couple more so I just now ordered the last two AC Delco joints they had. It's used for the steering shaft u-joint on Chevy P30 vans.