37mm or 54mm Thermostat?

Neither, I suspect. You really want the Motorcraft one, and probably the plastic parts around it.

2W9Z-8575-AB, should be about $15 (Is parts 1 to 4 below.)
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They are both Motorcraft and I think you answered my question.

MOTORCRAFT RT1163 {#2W938575AB, 2W9Z8575AB} 190 Degree Thermostat Info
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Bypass; w/ 37mm

MOTORCRAFT RT1154 {#96JV8575CB, XW4Z8575CA} 190 Degree Thermostat Info
Bypass; w/ 54mm
 

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