the MARS 11953 is the likely solution

3" to 10" W

it is specifically the genuine Nordyne replacement for the part numbers listed

What causes these switches to fail

The automatic reset functionality ensures the system resumes operation immediately once the temperature returns to the setpoint

White-Rodgers 36C53-418 Gas Valve R-410A the MARS 11953 is theThe White Rodgers 36C53 418 is a professional grade, 24V standing pilot gas valve designed for versatility in residential and light commercial heating applications. This slow open gas valve provides a 3 4" x 3 4" NPT connection and a robust capacity of 335,000 BTU hr (Natural Gas at 1" PD), making it an ideal choice for high demand furnaces and boilers. The slow opening feature ensures a controlled ignition sequence, reducing burner noise and