There's a DIY on a rear bar install in that section, which shows the mounts. I'm not sure about the diameter of the stock bar, but my own perception in that there is still a fair amount of understeer with the stock bar.
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Rain, snow, sleet, hail: 2009 Mazda 3 sGT HB
Everything else: 2009 370z, PW Touring 6MT
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