I got this set which covers from E4 up to E20:
http://www.amazon.com/gp/product/B0002SQEW8/
The steering rack is E12 and I imagine there are other uses of E-torx bolts, so I decided just to get an entire set. The local auto parts stores only had up to E16 so I had to order them off the internet.
Also after getting some more driving time in I notice less slop when I start to accelerate hard out of turns. I am more confident when applying throttle when unrolling the steering wheel and accelerating out of turns. Also, on very tight corners there seems to be less wheel hop on the inside tire when accelerating hard. Again, it's not like it fixes all the slop in all the bushings or the soft stock suspension, but it helps a ton. For the money and effort a great mod.