Hi,
I've tried several of the Jackpads available and found a couple of the wanting, gave them away. I found the biggest problem to be that the others increase the height of the Jack too much, little or no clearance to get it under the Car.
The best one I've found is the one sold by Pelican Parts.
But, the same one is available right now on eBay (from the Guy who
Invented it) for a BIN Price of $50+ S/H
see it at:
http://cgi.ebay.com/ebaymotors/Porsche-Boxster-996-Jack-Pad-Tool_W0QQcmdZViewItemQQcategoryZ43994QQitemZ460952 1131QQrdZ1
Hope this helps...
Happy Motoring!... Jim'99