That are adapters made to mate a VW TDI from a modern Jetta/Beatle etc to a Toyota transmission.
One that comes to mind is ACME Adapters. http://www.acmeadapters.com/index.php?sound=Y
Most of their stuff is for Suzuki applications but it is does it using Toyota transmissions and transfer cases.
I think the TDI's are only 1.8 or 1.9 litre as where the OM617's are 3.0.
