This is their response - does this sound right? I've never even checked under my car to see if it only has front coils:
Good afternoonI have spoken to 'EIBACH UK', thats correct they are front springs, most f10 5 series have air suspension on the rear, hence only two springs. But there are some models with no air (which is unusual), if you do have that type, we will need to have the kit returned and organise a 4 spring kit.
Reagrds
Emma@e-parts.co.ukcustomer support