A Funny Problem With Our Stove

Here's a link to some knobs described as being made of metal, though they look like plastic to me. I'm assuming yours and these all have the standard "c"type female opening on the back. Markings may not match those on the knobs you already have. The other thing that would work is replacement bbq knobs, available at many Walmart/hardware stores..

FYI:

Get ready for the porcelain finish around the burners on the stovetop to go next. That's another side effect of using pans that overlap burners by too great a distance.