I did the online chat, explained my problem, and the person at AppliancePartsPros suggested the correct part. They ordered it for me, including the extra knob (since it had been lost in the shuffle). The parts arrived quickly. I watched the video tutorial for instructions and successfully installed the new switch even though I've never done any repairs to appliances. It was an easy fix, and after 6 months, I finally have all the burners working on my stove. Wish I had done it sooner!