[nickshu]

Replace everything. Age matters more than mileage here. Also note the load is a bit more on the rear than the front.

I would do inner tie rods too they wear almost more than the outers do. (maybe that's what you mean by "steering rack tie rod"?)

Tuning fork arms (also called thrust arms or caster arms) too x4. Get the stock ones, avoid the polyurethane bushing aftermarket one. Factory was a monoball so they are really good stock, seems many people don't understand that and get the poly ones which actually reduce the mobility of the arm (dumb).

Strut top mounts x4 as well for sure. Those wear out often.

I have run Powerflex bushings on a 911. Honestly I would not recommend them. I did not notice that much benefit, installing them was a pain, and they squeak after the grease wore out. If I was going to do one thing to improve the stock suspension I would switch to solid caster pucks (thrust arm bushings in middle of the lower control arms). You can see by looking at them how much potential play they have as the rubber has big holes. The inner bushing on the LCAs is pretty much solid rubber, does not move around much. You can get the pucks from Tarett or Rennline. Getting the rubber bushings out is a bit of a pain, heat and an air chisel helps, but it's doable if you are a decent DIY'er.