Oh, there's one thing I forgot to mention about the rebuild kits. There are two different kinds of pistons and dust boots. The shop I ordered my kits from found out after sending me the kit's, there were two different types. Because, the kits they sent looked nothing like my originals. Apparently Brembo decided to change piston and boot styles without telling rebuild kit suppliers

. My brakes came off a '89 944 S2. So, I guess if have the newer version. The supplier said He's only sold the kit's that did not work on mine. So, this was kind of new to Him also.
Here's some pic's of the two different piston and boot kits. Mine are the ones with the groove around the pistons. The two pistons you are looking at are both 40mm. You need to know what size pistons you have before ordering kits. The fronts are either 38mm and 36mm, or 40mm and 36mm. The rears are all 30mm and 28mm I think, mine are anyway.
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1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans
1962 SC 1776cc SP 944NA brakes, 993 wheels
VKG