Product review (1 stars): False Advertising
When I ordered these replacement knobs, I specifically looked to see if they would fit my Jenn-Air CVG4280W Cooktop.  The product description indicated that they would fit.  However, they simply do not.

First, as you can see from the product pictures, a number of differently sized and colored adapters are provided.  Yet, with everything provided, none of the adapter inserts fit onto the stem of the burner dial.  The closest fitting adapters (the green ones) need to be enlarged with either a Dremel rotary tool or an X-Acto knife before they can be wedged onto the burner stem.

Second, after you have enlarged the adapter, it turns out that the replacement knob stem is too short to reach the burner stem.  As a result, there is no possible way that the knob can connect to the cooktop in order to operate the burners.

If I could give this review zero stars, I would.  This product is a complete waste of time, money, and effort.  A refund would be welcome but not expected.