Gotcha. Looks like what you bought were some upgraded halogen bulbs that are being marketed as "xenon".
Genuine xenon replacement bulbs for the Litronic housings are far more spendy than this. I'm betting they'd cost you something like 60 pounds. They're at least $79 here on this side of the pond.
Do be cautious using those bulbs. Brighter halogen bulbs crank out a lot more heat and just might start yellowing the insides of your lenses before they burn... and this is far more expensive to replace than just buying the 99 pound retrofit kit this same company sells to get genuine HID Xenon bulbs that are even brighter and run much cooler and won't yellow or melt the inside of your lenses.:
http://www.design911.com/HID-H7-Xenon-Light-Bulb-Kit-Porsche-986---996---Cayenne/prod793/
Plus, they'll last a LOT longer. All these aftermarket bluish tinted halogen "xenon" upgrade bulbs burn out in a fraction of the time of the factory-proper bulbs.
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