What is the part number for the knob only for a ZB2 or ZA2 non-illuminated mushroom button ?

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Issue:
Part number for the knob only for a ZB2 or ZA2 non-illuminated mushroom button

Product Line:
Harmony XB5/ZB5 Plastic Push Buttons

Environment:
22mm Push Buttons

Resolution:
The knob only is not a replacement part on the non-illuminated mushroom buttons in the ZB2 or ZA2 lines.