I got my thermostat with the housing which is plastic. Part no PEL100570 or PEL100570L(Landrover version which is the same). About £40.
It may be possible to get the stat seperately, but I couldnt find it. In my opinion, and as the housing is plastic, you wouldnt want the housing to fail in a few months as its not the sort of job you will want to do again. So I advise replacing it as a whole.
Matt
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