As Arthur mentioned, using the bracket (also known as the "classic") system (photo 1) is not a requirement for Centurion level.  Most of us use the nylon straps (photo 2)now which will get you all the way to level 3.          There are lots of troopers out there who prefer to be more screen accurate, and although Darren is no longer making the sets they should be available at Trooperbay: