Product review (1 stars): I wouldn't recommend unless you are certain they will fit your range
Both knob size adapters were way to big for my range.  And after about an hour of trying to make it work, I had to give up.  The black and white attachment pieces really didn't look different in size to begin with.  Plus it was incredibly difficult to insert them into the know to fit.
I wouldn't recommend unless you are certain they will fit your range.