Will be replacing the bushes on mine during my current restoration, I did quite a lot of research of my own on the various forums. Unless your car is a race car then where possible I think it is best to stick with standard OEM bushes. I know others will be along to say Powerflex are fine but I've also heard different things about them. One thing for sure is you know that the OEM bushes work and have lasted this long already. Don't want to be taking it all apart again later to change the bushings because the squeak or worse, because they wear out or wear the part they are meant to protect.
Which bushings are you looking at replacing in particular? I would avoid messing with the inner trailing arm bushes, when I removed mine from my 1990 Turbo with 200k miles they were fine. They are also a pig to get out and expensive! From Porsche they are approximately £70 each and there are two in each trailing arm.
The torsion bar outer mount bushes are still available from Porsche I'd recommend going with those.
For the torsion bar rear mounts you probably want to go for aftermarket solid mounts as the OEM mounts from Porsche are £££
Anti-roll bar bushes again I would go OEM, you may find your existing ones are fine as they don't appear to take such a beating as the front.
Anti-roll bar drop links you can get solid spherical bearing ones or aftermarket ones identical to the OEM part.
Spring plate bushes are not available from Porsche unless you purchase the entire Spring plate (not sure they are currently available), several aftermarket suppliers for these.
but I'm always up for giving it a go. I have a spacious unit and I'm having a lift installed, so I can get good access and take my time. I'm currently working on a rebuild of my 97 Defender, which is in bits awaiting new chassis and bulkhead.
