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I'm 99% sure the backing/dust shields are larger for the larger rotors. You could confirm this by looking up the PN on RealOEM. Do you mean X5M front calipers (6pot) or the M performance calipers (4pot)?
If you buy the MPBK, it comes with everything you need to upgrade to larger front calipers (4pot) and f/r rotors. Search up on the forum. There's lots of info posted on upgrading to either the MPBK or X5M brakes and the parts you need.
Last edited by shimmy23; 10-29-2023 at 11:11 AM..
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