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I believe I found it in the 986 Katalog on PDF page 242, illustration 807-05, #15. It's called a plastic nut, T5/30 x 5.1. The part number is 999 049 020 40. I imagine its a dealer part that costs about $1.50. You might try googling or ebaying the part number and see if you can find a supplier other than dealer.
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