This is a special mini Innofader Plus modded to work with either the DJM-S3 or the DJM-S9. DJM-S3 installation uses the Pioneer Plate. For the DJM-S9, the main piece is modded plus there is an added adapter plate and two screws for mounting to the S9 mixer.
Also for the S9, as shown on the drawing, you will need to remove the channel faders to pull out the original crossfader. Also the cable hookup is non-standard; you need to use the 3 pin small adapter cable. Make SURE you align the grey wire with the white wire from the Pioneer crossfader cable. ***DO NOT USE THE 4 PIN SMALL ADAPTER CABLE. IT WILL NOT WORK!
When you do the installation, you may notice that the dead space is a bit big. You will need to do the "left decrease lag" and "right decrease lag" adjustments as shown here.