Product review (4 stars): Modifications necessary for my range
I ordered these to replace the knobs on my 28 year old Kenmore Gas Range, made by Roper.  Buying the brand replacements would have cost over $26.00 PER KNOB!  That's far more than the range is worth.  I looked at a LOT of knob reviews for different brands online before purchasing.  Most of them claimed that the knobs in question did not fit their range or did not fit well.  Guess what, these did not fit on my range "out of the box" either.  HOWEVER, with ingenuity and trial and error, I found a work around.  Now the knobs are doing their job well.  All you need to do is select the plastic sleeve that fits your stem (the stem that protrudes from the range).  When I did this, and slid the knob onto the stem, it would not turn, since my knob must be pushed in, THEN turned to the left to ignite the burner.  If yours operates like this, do what I did.  I took tiny portions of a paper towel (although any similar material will do) and stuffed it into the knob shaft.  I filled about half of it and then slid it back on the stem.  Success.  The problem is that the stem is much shorter than the shaft, so the knob slides too close to the stove to be able to push it in before turning it.  Hope that description makes sense and helps someone else.  The only other problem is that the knobs feel like they could be slightly tighter on the stem.  If that continues, I plan to wrap the stem with a piece of electrical tape.

Some people had trouble with the circular overlays that you peel the backing from and place on the knob.  Its only been a couple of days, but so far they are sticking.  I am sure if they come loose, a dose of contact cement will remedy that situation.  They look nice and are functioning for a small fracdtion of what the brand knobs would have cost.  I couldn't bear the thought of the knobs being worth more than the range!