I was doing some searching online and found a different part number available for 2009 and up RX-8's. Here's a screen shot of an eibach pdf:









You can see part number 5552.140 while the 5544.140 is for 2004-2008.
BUT if you go to eibach's website, the vehicle part locator only shows 5552.140 part.
So I decided to call Eibach and spoke to a customer representative. She states that the 5552.140 has been "superseded" to the 5544.140? So I guess Eibach made a spring but determined they were the same and not needed? Just thought I would share since series II stuff is still new.