Product review (3 stars): No choice
I don't know why they call it a knob "assembly;" it's a knob, or a control knob.  The part needed to be replaced because it is too fragile and cracked, causing a safety problem, i.e., a gas leak.  I anticipate that the replacement will have the same problem.  The stove model is discontinued.  The picture is excellent; it clearly shows what you are getting.