Product review (5 stars): Rubber Feet
These little rubber feet are a pretty simple item, but they provided exactly what was needed for the grates on our KitchenAid 5-burner gas cooktop.  I installed that cooktop about 12 years back when we built our kitchen, and about two years ago some of the rubber feet on the three grills needed replacement.  We tried the easy route first by sticking little round felt pads on the legs, but the heat from the burners tended to melt the adhesive and that solution didn't work out very well.  I checked the internet for parts and could only find replacement grills for this cooktop, not replacement rubber feet.  So, I decided to try rubber feet intended for a different brand, fairly confident I could make them work with glue or potentially drilling out the holes in the legs if necessary.

Turns out these feet fit a little snugly, but they work great and have a nice pad to sit on the stainless surface of the cooktop.  I cleaned out the twelve grate holes with a drill bit, picked up a small tube of black high temperature RTV gasket maker from Autozone, and set the feet into the holes.  The RTV is good up to 500F, so I'm thinking that should work pretty well.  If you do this, I'd recommend wearing disposable gloves like the Diamond Grip brand sold by Amazon to keep the RTV off your fingers.  Those are really handy gloves, by the way, and a box is very inexpensive.

Bottom line is these little feet are a great product and very cost-effective, and the seller delivered them promptly.