2013 Leveling Kit question
 

I just traded my 2008 KR for a 2013 KR and wondering what makes the 2008 leveling kit (spacer over the shock tower) not compatible if indeed it is not? I have two HEAVY METAL brand spacers laying around that I want to use.
Also why won't 2008 model specific Bilstein shocks work on a 2013, the mounts look identical?

Thanks for the help.
Joe