That's simply not true. Not only are all the parts still availale, Messicks has them in stock as I type this. Granted the price did go up quite a bit from when I bought mine a few years ago. You're looking at $300+ for the bracket, mounts, and hardware.Mine was said to have been one of the last ones in stock, back in 2006 or so... Kubota stopped making them.
It will need to be built.