I have a set of the McMasters Carr bushings. They are the same size but do not look like the are the same quality of bronze. I know nothing about metals. They are very cheap though at $2.33 each. I had to buy my last set from Calmini which with shipping was $54.
I really do not want to pay that every few months. My steering is unsafe at this point with the worn bushings. At highway speeds its very difficult to keep a hold of the wheel. I've got a lot of wheel shake. I don't know what the solution is either other than SAS and right now that's not an option.
The claim on the website is true. But, you can also rebuild the stock system as well and save the initial $500.
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ECXC 2K12 Organizer