Product review (2 stars): May not fit Jenn Air commercial style cooktops.
This was the correct part number for my Jenn Air cooktop (Jenn Air is a Whirlpool company) and when I got the part it matched the other knobs in every way, except that it did not fit on the control shaft of my cooktop. My existing knobs have a larger hole and the new one was smaller with a small metal spring sleeve inside. I had to remove the sleeve and drill the hole just large enough to press on. The hole is no longer keyed to the shaft, but I was careful not to make it too large and it makes a good friction fit.