I have a two element water heater made my State Industries about 10 years ago. The upper thermostat is factory set with a high limit trip (red button) (an APCOM Model WH8S). The lower thermostat is adjustable (APCOM Model WH7). The high temp limit has been tripping and I’m not sure which element is bad. I want to replace them both, but I can’t seem to find these thermostat models available anywhere — must be out of production. Can anyone help me find a place to order these thermostats? I’d sure appreciate it.