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It is difficult to match spacers with aftermarket wheels.
The type hub on the spacer will have to match what is on the wheel. Also, ANY corrosion on the car's hub can cause issues with the spacers fitting properly. The hub needs to be cleaned thoroughly before a spacer is installed to avoid any vibrations.
H&R released a different part number specific to the 1M, so if you are looking at a spacer that shows several BMW models, it may not be a perfect fit. The outer diameter of the spacer itself is slightly larger on the 1M, all the other measurements are the same.
These are available in 10mm, 12mm, and 15mm.
Edit: Also, as noted above, longer lug bolts are recommended as well.
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