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According to this page over on RealOEM.com, that would be item number 6, expanding rivet, with 07130702966 as the part number. Hope that is correct because I'm needing a couple of these after today's brake job!
Mini-Mania also has these available in packs of 10 (I believe).
I have cut the head off of a "difficult" screw with a utility knife and pushed the remainder back into the hole. This section often just drops to the ground. Depends on which screw you need to remove.