P-[P-2-K-M-3954-S
By default, your Zoom75 kit comes with a modular kit for a rotary knob. If you want to change that to an LCD screen, badge or two extra keys. You'll need to purchase one of these modular kits.
Zoom75 - Modular Kits - Batch #2
Zoom75 - Modular Kits - Batch #2