Control arms help

non-M 335D sedan owner here, want to upgrade my stock springs/shocks into something a little less outdated. Have been looking towards the Bilstein b14 Pro-kits, however, when looking into refreshing the control arms, the M3 control arm upgrade which i’m interested in seems to be not compatible with rear suspension components of some of these setups. Would the solution be to solely switch out the front control arms, or to switch out both and get a suspension kit for the M3, asking because I don’t know and can’t find it online, interested to know what others have done suspension-wise along with their M3 control arms on non-M3’s.

non-M 335D sedan owner here, want to upgrade my stock springs/shocks into something a little less outdated. Have been looking towards the Bilstein b14 Pro-kits, however, when looking into refreshing the control arms, the M3 control arm upgrade which i’m interested in seems to be not compatible with rear suspension components of some of these setups. Would the solution be to solely switch out the front control arms, or to switch out both and get a suspension kit for the M3, asking because I don’t know and can’t find it online, interested to know what others have done suspension-wise along with their M3 control arms on non-M3’s.