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2006 STS 1SG & 2007 STS 1SE
8,201 Posts
Same size + different spring rate = different sway bar in my book.

I could imagine the front drive components resist aspect changes much like the larger V front sway bar and therefore a similar rated rear sway bar would be called for. If it had the same spring rate, wouldn't GM use the same part number?

Could the same part carry two different part numbers depending upon the car to which it is fitted?
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