You're talking about the Civic EX four door rear sway bar right? Because 2dr EX's never had rear sways, I'm sure you knew that
You'll need rear control arms that will work with the GSR sway, if you wanted an ITR rear bar I'll have a brand new one up for sale with the Beaks SRK quick swap kit, GSR rear control arms, and endlinks. Haven't posted it yet because I want to take pics first. But ya, just get the arms, d-brackets and endlinks, which you probably knew also
Good luck.