Actually I don't think you need to buy that. Have you lubed up that bearing pretty good and made sure everything was aligned properly?
I don't know if you want to spend that kind of money on something that you could just fab your self or make yourself? You might want to twisty tie that aluminum had onto the spring also. Here's pic.s


I used a protector from my friends Aerospeed Coilovers (i think) when I had my GC's and just lubed that protector and the bearing, made sure everything was aligned and locked into the right position and the noises went away.