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For a '96-'97 you can only get then at dieselsite.com. If it is a '95 or older it is standard and can be bought at the dealer or maybe the parts stores.
Blankie (Jim), you may also want to get the thermostat housing neck also. They tend to not seal and will rot thru. The new one also has better a seal.
wmiller, the '95 and older are shorter and will fit in the '96-'97 housing but it is not long enough to seal against the backside for the by-pass and therefore will keep the truck cool at the gauge but the rear of the motor will skyrocket in temps. Therefore cooking your motor from the back forward and you will not even know it. The '96-;97 thermostat is longer and the 203° stat is only made by dieselite. This explanation is to the best of my memory and may only be partially accurate but you get the point. Gettin' old and memory does too. LOL