This part is also sometimes called Ram 5500 Thermostats. We stock thermostat parts for most Ram models including 1500, 2500, 3500, ProMaster City, ProMaster 3500, ProMaster 2500, ProMaster 1500 and Dakota. We stock these Thermostat brands for the Ram 5500: Gates, Mopar, API, Stant, BD Diesel and Motorad UltraStats. Crank Case Heaters Defrost Thermostats Defrost Timers Door Gaskets Driers Fan Relays Furnace & Plenum T-stats General Heaters Glass Heaters Hard Starts Instruments Motor Protectors/Overloads. Exact Size Replacements - O.E.M. to SUPCO Gasket Cross Reference.Gates Thermostats Quick Reference Guide Earlier this year, Gates released its NEW range of thermostats. Gates is the first in the industry to supply thermostats in Celsius. While other suppliers’ thermostat part numbering reflects temperature in Fahrenheit, Gates thermostats reflect temperature in degrees Celsius.