thermostat replacement

Hi Paul-Welcome to FABO!

Gasket goes down on the manifold. Thermostats fits inside a lip on the thermostat housing w/2 bolts. Check your housing surface is straight as some are not due to the thermostat not being centered correctly and the bolts being tightened down excessively trying to stop the inevitable leak. I cleaned all my surfaces real good, put it together and snugged the bolts-no leaks! Good luck.