Thanks for the response.  It sounds like it's a required part.  I didn't see this listed on the DIY instructions on the Pelican Parts 101 projects forum, which is why I'm a bit confused on the reuse or replacement of it.  However, I was wondering how the brake pads would retract and not touch the rotors without something like this to keep it stuck to the pistons.
Question: What kind of glue shall I use (or just the anti-squeal compound)?
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					Originally Posted by Ian c  What you have there are "mushrooms" , or anti squeal fixings .You could reglue them onto your new pads , or buy new ones .
 Not sure on the current prices from porsche .
 Basically , they fix your pads to the pistons so they go out as well as in ...
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