[STALKER]

Originally Posted by M3SQRD

Yes, M3 and 1M suspensions are compatible. They use the same F stock upper spring/damper mounts (as well aftermarket camber plates) and lower strut mounts (1M uses the M3 steering knuckle). The R upper damper mounts also are the same (two cylindrical bushings preloaded by two "washers") as well as the lower damper mounts (1M uses the M3 rear lower control arm).

As for spring rates, are you looking for a street or dual-purpose setup?

Thanks for the info.