This part is listed by BMW as BMW part number 32411129986 (32 41 1 129 986) and is described as Genuine BMW Gasket Ring, A14x20-ALMG, which is an aluminum crush washer / gasket ring with a 20mm outer diameter, which is just a small amount smaller than an American Nickel (for reference) and an 14mm inner diameter. The ‘ALMG’ refers to Aluminum-Magnesium alloy, which is what the crush washer is made of.
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