I believe that what you have is the outside air temperature sensor (sends temp info to the air conditioning system, etc). The rubber grommet is meant to pass through a hole in the radiator ducting behind either the right or left side bumper air inlet. It's on the passenger side on U.S. cars, not sure about UK.
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'01 Boxster S (purchased new) triple black, litronics, cruise, heated seats,18's.
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