Packard Automatic Small Flush Mount SPST Limit Thermostat Part Number PLF158VB.
L158-40*F. Automatic reset.
Cut out temperature 158*F. Cut in temperature 118*F.
Terminals are vertical and 3/16" width diameter.
Mounting holes are 1" apart center to center.
Fits on gas fired furnaces, unit heater, and rooftop units.