The parts are under the stovetop and the knobs are attached to them. We bought the correct ones from AppliancePartsPros, these were the correct ones. Seems we have an oddball stovetop. It's a GE drop in stove. The parts were easy to change. It was a simple matter of putting the wires on the new switch in the same place there were on the switch. I took phone pics of the wire locations before I took them off and only did one switch at a time. Turn the power off at the breaker panel first of course.