Tim and Deve, thanks for all of the help.

The thermostat that I found is NAPA THM 155. The price was $8.37. There were two at the local Phoenix warehouse, so I bought both.

The NAPA website states that they are out of stock and there is some scuttlebutt on other websites that it has been discontinued. I checked with my local NAPA store and they told me that it is an open stock item regardless of what it says on the NAPA website. My advice? Use the above part number and call your local NAPA if you are looking for one.

Thanks again for the help,

Matt