come again....i know it is late, maybe i missed something....
wait, was reply for the guy whose car wont start (on another thread - with the fuel issues? if so, you were answering something i was not sure of. thanks!)
Get the adhesive backed gasket - it will hold the t'stat in the housing when you're re-installing it. Also a good time to replace the upper radiator hose and the bypass hose as they both have to come off to do the job.