It is a direct fit for the 313300 alias

this part is specifically bored for natural gas

specifically the P110-SBP2212

Does this unit require a separate start capacitor

White-Rodgers F61-2301 Wall Plate It is a direct fitWhen you are cleaning up a thermostat installation and need to hide wall damage or an oversized footprint from an old mercury bulb unit, the White Rodgers F61 2301 Wall Plate is the professional standard. Measuring 5 5 8" x 5 3 4", this white thermostat wall plate provides a clean, finished aesthetic for low voltage thermostats. It is purpose built for compatibility with several classic White Rodgers series, including the 1D51W, 1D56W, 1E30W, 1E56W,