I have an old Frigidaire Custom Imperial Flair Double Oven RBGH-345 that needs a thermostat for the small oven (part #07526435 or RobertShaw 5420-005). Since these are not available anymore will a “universal” thermostat work? I see a lot of different “universal” thermostats for sale but I am wondering if “universal” means they are broadly compatible with different thermostats or if they are not as compatible as the name implies. How does one find the right universal oven thermostat? Thank you for helping me understand this issue.