Product review (3 stars): Needed a bit of modification.
I think these must be the only replacement knobs available on the planet for my old stove, so I shouldn't complain.  However, just like the last set of knobs I bought (YEARS ago) they are too hollow inside to push down on the stems that control the heat on my stove.  Luckily, we have a handyman in our house that figured out how to modify the insides of the knobs by adding a metal crossbar.  Now they work great!