Due to a warped rotor, I'm going to rebuild my front calipers while I'm in there swapping out the warped rotor for the new one.
Porsche only sells the dust boot, not the all-important pressure seal, but this company has them.
http://www.zeckhausen.com/Brembo/Consumables.htm#Rebuild
Scroll to the bottom of this page for their toll free number. They're located in NJ.
BTW, if you find that your high mileage 2.5 boxster needs a caliper rebuilt, then ask for the proper sized kits. Your calipers are four piston Brembos, and the pistons in the leading side of the caliper are slightly different in size from the pistons in the trailing side.
Ask for one 36mm kit and one 40mm kit PER WHEEL.
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This public service announcement was brought to you by a frustrated boxster owner who would like to enjoy a couple of months of repair-free months of Porsche ownership in 2008.