My local NAPA store will have them tomorrow for me. $10.39 each (+tax).
I shouldn't have any fitment issues with the Bilstein HD's in the back because I put all new OE foam crap bushings on when they installed the Bilsteins. I could have saved about $100 if I knew this a couple of days earlier
I hope this eliminates some of the bounincess in the rear when going over bumps. I can't imagine it would make it any worse.