I'm pretty sure the B12 is just a specific set of Eibach springs bundled with a specific set of Bilstein shocks. They're not specific Bilstein springs - they're just a 'matched set' (ie. the shocks were specifically made to match those Eibach springs).
From what I understand you can make your own B12 kit by buying Bilstein B8's and Eibach Pros - it's just more expensive that way.
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