http://www.partselect.com/Schematics/Frigidaire/Frigidaire_Thumb/K3XFDW11.gif
See part 29 in the diagram

Control Knob - White

PartSelect Number PS2330888

Sold individually. This knob accepts a D shape shaft.

This part works with the following brands: Frigidaire, Gibson, Kelvinator, Kenmore, Tappan & White-Westinghouse.