Product review (4 stars): So, half the reviews said that this set of ...
So, half the reviews said that this set of stove knobs fitted the reviewer's late 80s model Whirlpool electric range, and the other half all bemoaned the fact that they didn't fit at all.  I took a chance, given the fact that my "Bake/Broil/Off" knob had completely disintegrated on my Whirlpool electric range, and ordered these.  As an aside, my range, which came with the house, is so old that apparently not even Google has a reference to its model number.  I think it might even be older than the house, which was built in about 1979.  And luckily for me, the replacement does fit.  As some other reviewers noted, the knob doesn't sit flush, but it works, so who cares.  I went and replaced the other five knobs at the same time.  Those all do sit flush.  It's just the "Bake/Broil/Off" knob that won't entirely co-operate.  But who cares, because I can now use my [ancient] oven again.