I found a similar solution. My local Ace hardware has stepped rubber grommets. The firstone I got was3/4 x 1/4 inch. It worked, but I had to push them in a little harder than I like (I don't have smalle kids - these would be better for small kids!), so I went back and got the 5/8 x 1/4. They look a little bigger than the onew in the pciture above, but they work well. The grommets are in the parts drawers in the hardware section - look for "Grommets" (may be "rubber grommets". The smaller side goes toward the range.
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