There should be a label on the back with the model number and manufacturing date.
I have replaced 2 thermostats on SM008 smokers because they would not heat up. I also have a Smokin Tex that required a new thermostat because it would go to max heat and never cycle on/off (but would shut off with knob turned all the way down).
Replacing a thermostat the first time is a 2 job. Biggest thing to keep in mind is that you don't want to kink the capillary tube. There are some You_tube videos that help.