This is the plate for mounting a full sized Innofader Pro2 or older Innofader model to the VMS4. You swap out the original plate with this one, and this one gives the extra room needed to fit your Innofader.
Not needed for an Innofader PNP3 since the Innofader PNP3 is shorter, but needed for the Innofader Classic, Innofader PNP, Innofader PNP2, and Innofader Pro.