honest mate dont bother lowering it.i had a focus saloon on 60mm pi lowering springs with escort cosworth alloys running 205/40/16 it proper looked the bollocks but with the speed bumps round my way anyone other than myself in it and it would hit the sills and floor which is not wot u want plus even when i went other bumps after putting the original alloys back on it still feels like every pot hole u hit is like hitting a wall.as for rear springs if u still want to go ahead and do it cut the original springs in half while the cars jacked up and u should be able to drop the lowered spring straight in save taking the back end apart cause there a bastard to do lol