If in doubt opt for square set up all round, either
8" ET34mm F & R and keep oem staggered tyre sizes F & R [same as my setup]
or
8.5" ET47mm F&R with stock tyres as above.
Either way will work, 8.5" wide rims may allow you to run wider tyres than stock ie 235/40/18 F and 255/35/18 R.
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Fettled M135i EB AT then AW M2 DCT - both gone but not forgotten:
Current '22 X3M LCI..
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