Eibach springs
Like Mitch stated, shocks control the spring oscillation whilst springs support the weight and set the ride height, therefore if the springs sag then it's a problem that can only be corrected through spring selection.
Any particular reason for wanting an Eibach Pro-kit?
AFA Eibach quality, it's not that the spring material is bad (it's not), it's just that for the Camaro springs, their rear spring rates are less than optimal, which is why they tend to "sag" so easily. Nevertheless, no shock per se will solve a "spring" quality issue.
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I found it in less than 3 minutes using search, though it would help if it was a sticky.
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