debug, you're right about M3 / M4 having this fastener. I cannot confirm what's there on the M2C, but I can say that you don't need anything there on an M2 retrofit.
I think I saw a post where one user put a nut on the other side so that it looked more complete, but it's not necessary.
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2018 ///M2 LCI, LBB, 6MT...
Current Performance Mods:
CSF FMIC, ER CP, Fabspeed Cat, Aquamist WMI, GFB DV+, NGK 97506, BM3 (Stage 2 93 OTS), CDV delete, UCP, M2C/M3/M4 Strut Brace, M3/M4 Reinforcement Rings
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