I notice there are two screw holes dedicated to attaching the Universal Fader Wing to the Ion, but I have lost the appropriate hardware. What type of screw do I need to secure these two products together?
The screws are ETC part number HW1185 [SCR 4-40 x 3/8].
The screws are used to attach the Ion bumpers to the console as well. A replacement Ion Bumper kit is ETC part number 4310K4000.
If you are going to dock your fader wing, you will need to disconnect the power and USB cable from the back—they cannot be used while the fader wing is docked.