best for peace of mind to buy new Strut tops and bearings mate.just be careful when tightening the nut on the strut as you dont want to split the bearing with over tightening.Installation guide here http://www.nclh.org/car/coilover_howto/Useful link here aswell mate. Go below 40mm lowering and you'll need to upgrade your Anti roll barhttp://www.golfgtiforum.co.uk/index.php?topic=89176.0