For those of you that are commiserating here about the price of Kubota parts-believe me when I say I find them to be very economical. Why do I say that? I also have a Massey Ferguson GC2300 (2008MY) and the parts pricing is astronomical: bogie wheel for the mower deck $124USD (there are 4), replacement plastic grip for the PTO lever: $17, oil filter $22. I did not know this when I bought the 2300, and had I known I would have demurred. I'm going to modify the Massey deck to accept Kubota bogie wheels ($14-18 each at my local K dealer). Otherwise I'm happy with the 2300.
There seem to be a lot more of the B6000 Kubotas in Europe (witness all the Youtube videos), and there are several specialist suppliers. Tracpartz.com is the largest of these. They have new B6000 exhaust / muffler cans (can't find one in North America) for 75 Euros ($84USD) plus shipping. Had a friend who was restoring a B6000 here in Ontario and he said he had the muffler delivered within a week, fit perfectly and even came with a new chrome heat shield.
When I get tired of paying AGCO for the Massey parts, I'll sell it and buy a recent model B, but not one with any computer or special assembly that can only be analyzed and repaired at a dealer (mucho dinero $$$). But I digress...