Obviously this subject line needs explanation.
Minding my own business on another forum, it came up that someone had a v drive setup that was off one of these engines. Turns out, according to this person, 30 of these engines with v drives still intact were shipped to Toyota Racing Development for use in race cars and/or trucks a couple of years ago.
Maybe that is why you can only buy a direct drive engine now as a replacement, my guess is for whatever reason all the spare v drive engine assemblies were taken apart and the engines removed for racing.