...Listen to the facts! NO 'Skirts'! You Have Two of the Wrong Thermostat! I'am going to say this once more... Tmeyer.com has the correct RS Thermostats. With 'Hats', understand That!
...Take it from someone who has modified well over 640, (Quality Controlled and Documented) of the 330 RS Stats. All for the good of the 351 Cleveland.
MJ