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The rubber expanding nut with the threaded sleeve is commonly called a well nut. They are cheap on ebay - I believe they are used to hold some motorcycle fairings in place, among other things. The nut and bolt are m5 x 0.8 pitch. Seems I recall a length of 30-35 mm for the bolt. The shape of the bolt recess on the plastic cowling makes it hard to fit a substitute, but I recommend finding a stainless thumb bolt that will fit. You should be able to force the old well nut out by pulling.BOL
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