You definitely should replace the gasket. Did the thermostat you purchased not include the housing? If so, someone else will need to address your question. When I replaced mine, the housing was included. (See Pelican)
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2000 Boxster S, 6 speed, Sport Package, Litronics, LED tail lights, LNE IMS-B, OBC, Skybreaker wind deflector, Arctic Silver/Graphite Grey
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