I have the Part #GE WB3K60 for the Thermos Knob.
My question is: What if I buy the part and it does not fit?
Answer Alice, according to the manufacturer the replacement knob part number WB3K60, our part number WB3K60, is the correct knob used on your unit. If for any reason the item does not fit you may return it at anytime. Here is our return policy link for you to view, thanks! http://www.appliancepartspros.com/customerservice/returns.aspx