looks like "D" brackets like for holding a pipe like copper water pipe to a wall... thats on the bottom fan bottom screws then it use a piece of metal with to holes drilled- x4 the metal pieces these hold the middle fan to the top and bottom... the looks like zip ties on top but you could fashion bolt on hooks for the top bar and do them hooked first and secure bottom later... thats my guess... but no the case comes without that, but they prize the case on "moddability"