[j.fro]

Porsche offered two composite trunklids, one for the Aerokit I, another for the Aerokit II. They may still be available from the dealer.
Aftermarket:
Getty Design - Decklid, Bumper, Roof, Quarter Panel for Porsche Boxster Cayman
Porsche Tails Wings and Spoilers & Body Kits for 911, 930, 993, 996 E36 E46 BMW body parts: Lexan Race Glass Windshield
986/987 Boxster Parts — GT Racing

have fun!