Found a thread -- currently reading through it to see if anyone else has found a source.
https://www.1addicts.com/forums/show...=647346&page=2
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Apparently this Mercedes bolt is compatible.
Ordered a set.
https://www.1addicts.com/forums/show...&postcount=144
https://www.fcpeuro.com/products/mer...mer-0039907905
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For future reference this bolt may be compatible but I didn't double check the specs
https://www.probolt-usa.com/titanium...&isp_ref_pos=4
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2011 135i M-Sport Cabrio (DCT, Black Saphire, Coral Red, Seibon Carbon 1M body, FBO Stage 2+)
2020 M2 CS Manual (6MT, Hockenheim Silver, GLD 763M)