No, I got them right from the Tequipment book for the Boxster S. They are 18x10 in the rear and 18x8.5 in the front. I put on the 5mm spacer kit from the 550 because I like the wider stance and to fill the wheel wells. They are pretty light considering the size. 
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2006 Lamborghini Gallardo 6spd-Rosso Leto
2006 Range Rover Sport Supercharged-Winter Beater
2006 BMW 750i 19" Sport Wheels BK/BK-Daily
2005 Lotus Elise Sport & Touring Package-Fun
2001 Lexus RX300-Back-up Winter Beater
2001 Mercedes-Benz S500 Sport AMG-Sold
2000 Boxster S Heavily Modified-Sold
2000 Nissan Altima GLE-Parking Spot Holder
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