i might buy this when i order my koni orange struts/shocks. how about the front ones, do they required changing also?
I can't think of anything for the front, bushing wise, that would need to be replaced by a company like powerflex. However, while you have them apart, hit up your dealer or online OEM dealer and get a pair of front bearings for the upper mounts. The mounts themselves are solid, but there is a bearing that is in between that can wear out. They're pretty cheap so definitely worth replacing while you have them out and apart.
I like the spring pads from powerflex since I have mountune springs with a small reverse rake, but I want to install these Bilstein coilovers I have first, if I don't like them as much I'll definitely be picking the upgraded spring pads before I reinstall the Mountune springs!