I will be installing Eibach lowering springs soon and want to rebuild my existing OEM PASM struts on my 07 997 turbo (25k miles btw). On the fronts I am thinking to replace the bellows (#5), bump stops (#6), rubber contact plate (#9), contact bearings (#11), and supporting mount / top hats (#12)). On the rear the bellows (#7), bump stop (#8), and the base (#4).

For those of you who have done this before, are their any parts I should add or remove from that list? What about the rear top hats? I haven't run across any DIY info that mentions replacing them. Not sure if they wear or not. They are pricey too.

Here are the parts diagrams for the struts.