Product review (3 stars): I Just used the numbers to give my old knob a "Face Lift".
Good luck figuring out which of the two inserts to use (the little black or white thingamajigs needs to be pushed into the center hole so the knob can be mounted onto the the steel post). Careful, because you only get one shot it, and if you do not line that insert up to the right position on your first try, then too bad, because you won't be able to take it out and you might end up with a knob that sits horizontal in the off position instead of vertical. That's what happened to me, and even with pliers I couldn't remove the insert without busting it up (it's plastic). But it wasn't a total lost, the silver colored "ring inlay" that has the temperature numbers on it, has an adhesive backing, so I peeled the off the plastic film to expose the adhesive and stuck onto  my original knob (which was working but it's numbers had faded away) So basically my old knob now has a New Face. I hope you find this review helpful.