Product review (1 stars): Not whirlpool
We bought this knob to replace the ones we have on our BRAND NEW whirlpool cooktop because we wanted the stainless steel chrome look and the original knobs are black.  Not only does this  knob not fit, it's cheap and flimsy.  The fact that's it $20 for 1 knob is crazy too, the knob isn't worth $2, thank goodness I only bought one, which I'll be returning.
Don't buy it if your looking to upgrade, unless your cooktop/oven is from the 90s