i already have a jl 450/4 powering the 6.5 and 6x9 and a jl 500/1 powering a jlw6.. i want to throw in some 4 inch speakers but i want it to look clean and i only have the two speaker grilles, but someone on the classifieds is selling the four speaker wasnt sure if i needed the the entire rear panel or only the speaker grilles