The one I bought had 3 rubber rings inside the cone to adjust for size. Ended up leaving the last one in and had to do some serious pushing to get it on, but it's on now, nice and tight. Just made sure that the ring was tight for no slippage or air leaks.
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Current: '21 M5C, '15 X6 50i Previous: '18 M550i, '16 550i, '11 335is, '09 E93 M3 DCT, '10 E90 335d, '07 E90 328i
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