Product review (5 stars): Just like original
Fits our cooktop perfectly.  I wish Jenn-Air would make metal knobs for it, because the plastic melts when a hot pan hits it.  In the past we've replaced all 4 knobs with a new set.  I could not find sets this time - just the single knob.  I only needed one, so it worked out fine.  It's exactly like the original knobs.