After spending many hours...well, maybe minutes...
I guess this topic has been touched before, the final answer was:
the 2100 that says no lowering for stock ride height only, was release before the 2150 kit was. The 2150 kit includes the same shocks as the 2100, but includes the eibach pro kit as well. The reason for the statement, "for stock ride height only", is because at the time, there was no paired/koni selected springs that were working well with those shocks valve settings. After eibach release the prokit, koni added the 2150 kit
To jlevisw, I apologize if I made it seem the product you were selling was wrong, it is in fact, not wrong.
Canon 14 F2.8 L II : Canon 50 F1.2 L : Canon 24-70 F2.8 L : Canon 70-200 F2.8 IS/L : Canon 5D Mark II : B+W Filters : Photo Whore