I have an Imacon ixpress Digital Back Interface Plate for the Mamiya RZ67 system. It will take Hasselblad V Mount backs.
Condition is excellent. It comes with a handy instruction manual, as well as a sync cable if you are using a non-D camera body.
Since I know these are somewhat scarce, I am open to shipping worldwide at cost. If you are within the CONUS, it's $600 p/s.