Its a alum. box made by Lain Li that attaches to the back of the case allowing you to push the power supply out the back about 60mm. This allows for more room in the case.
in my oppinion the radiator grills look real cheap, why didnt u use some grills from aqua computer and paint them in the same color of your frame or in black
I agree with the one color i have already removed the plates and painted them black this morning. The rad grills are not cheap They are 3/16 thick billet alum. with 360 degree centers that turn to where you want them. anodized black.