What is the catalog number for the knob only for a ZB4 / ZB5 illuminated selector switch?

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Issue:
Separate part number for ZB4 / ZB5 selector switch knob.

Product Line:
22mm Harmony Push Buttons

Environment:
Harmony XB4/XB5 Selector Switch

Resolution:
We don`t offer the selector switch knobs as a replacement part. They must get the entire operator head.