I looked for D-shaped oven range knobs that were all metal and replaced them. I looked at many ovens at Sears, Best Buy, etc. in order to identify the knobs I liked, matched the GE Profile stainless steel oven I had, and then looked for the model numbers online to find the cheapest I could find. I did and they work beautifully.
I used a Whirpool oven knob to replace the GE Profile knobs.