[thstone]

Due to old age and mileage, items 2 and 3 were necessary on my car. There was no point in upgrading the suspension + having adj lower control arms if the upper shock mounts were going to have a lot of slop. The condition of these and other remaining suspension components will vary by car - replace as required.

The PSS9 shocks are a direct bolt-on - the Tarrett spring adapters are not needed as long as you use the springs that come with the PSS9 shocks. If you use another aftermarket spring, then you might need the spring adapters (depending on the size of the spring).