For sale is an used the Mamiya Aptus-Rollei Lens Control Interface Cable (42.5"), which was bought NEW and worked on a Leaf AFi back several times,  with a self-made sync cable.  All sales are final!

It does NOT work for Phaseone or Leaf Credo digital backs.
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Mamiya 216-00094 Overview

The 42.5” Aptus-Rollei Lens Control Interface Cable from Mamiya is used between the Leaf Aptus-II or AFi Digital Camera Back and the Rollei Lens Controller. It features a 4-pin Lemo-type connector on the Aptus side and a 14-pin Rollei-specific connector on the Rollei side.