Product review (5 stars): They fit!
After countless trips back and forth to the local appliance shops, these knobs fit.
Even our local large chain, says they carry products for the Jenn-Air cook tops, but none of the knobs they carry worked.
We have an electric cook top that is about 27 +  years old, in the home when we bought it and works well accept for the knobs were falling apart. These fit nicely, and look just like the old ones.
Shipping was three days ahead of the estimated time also. Great Product and Great company to order from.