These are probably the caliper guide bolt bushes (PN B34.11.1.157.038) otherwise known as 'Repair kit guide bush'. There are 2 on each brake caliper, quite expensive for what they are. I just replaced my front ones this last week after noticing quite a lot of play on the moving part of the brake calipers (100500 miles).
Rob
E53 3.0d Sport
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