Product review (1 stars): My best guess is that the knobs being sold by Amazon ...
You may read the rest of this review, but I have critical new information the wasn't included in the original review. When I realize, the knob I purchased didn't fit, I went to the Winston-Salem public library where they have a 3-D printer.  I gave them a working knob and the librarian made of copy of it.  The new knob works fine.  The only problem is that the 3-D printer cannot print the white labels.  Nevertheless the 3-D printer is far better then the knob offered by Amazon. Thus, don't waste your money on this knob; find a 3-D printer and make one.  It took about 2 1/2 weeks to load the correct specification into the 3-D, but now since the library has the specs, the knobs are quick and easy to reproduce.

When I ordered this Jenn Air Burner Control Knob, there were no reviews.  If I read the reviews, I would have never bought these knobs. There are several problems.
1. Amazon enables customers to view the back of the knob to see the part number.  It is the correct part number which is the reason why I bought it.
2. The plastic connection assembly is too long.  Thus, the knob hangs out too far.
3. The labels printed on the knob are upside down compared to the originals.
4. Bottom line: these knobs have the wrong part number

I have looked at the other "so called" universal knobs.  Reviewers commonly state that the universal knobs cannot fit their stoves.  I am angry at the Jenn Air for failing to have knobs available.  My best guess is that the knobs being sold by Amazon are manufacture rejects that somehow got back on the market.

So --- now, I have an expensive stove with a missing knob that I haven't been able to replace.  Other products list the specific machine the part fits.  For example, all printer cartridges list the types of printers the cartridge fits.  Stove knobs should be required to have the same specifications.