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when I started to rebuild them, one contact told me these kits are no available from Porsche.
when I was searching threads, found a reference to StopTech. I knew about them but had never ordered anything. contacted them and they said they had kits for these calipers. ordered and found they matched the piston sizes but had dust boots, not the older scraper rings.
out of ignorance, I had initially thought all the dust boots had disintegrated. was not aware of these scraper rings. I had already pried the scraper rings out of one caliper, damaging a couple. up to now, all calipers I had rebuilt used dust boots.
since these caliper/pistons were not made for dust boots, they would not fit. the metal retaining ring on the dust boots is about 2mm larger in diameter than the machined space for the scraper rings.
I found that a couple of the correct scraper rings are available, but not all. what I got was from Paragon Products as I found them on their web site. I suspect PP may have them, but did not find on their web site at the time.
so ...
IIRC all that remains is the 38mm and 30mm, and the 36mm and 28mm are no longer available.
after some improvising, I was able to cut a very small section of the metal ring on the dust boot so it would compress into the space for the scraper ring.
well.... since not made for dust boots, not enough space for the dust boot to fold down flush and it kept popping off the piston when compressed into the caliper.
after more contemplation, turned the dust boots upside down, and then trimmed all the excess 'boot' material so what was left is the metal ring and just enough of the old dust boot to act as a seal to prevent debris getting down and causing damage to the internal seals.
destroyed a few dust boots getting this to work, as cutting the metal ring can lead to the rubber boot material tearing too much to be useful.
once I learned all this and began on the other calipers, did replace all the inner seals but retained the scraper rings as they were actually in good shape.
good luck, but it appears we are limited in this area by what is available. if what you need is just the internal seals, the ones from StopTech worked fine.
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