When you order from GC, they will put the overflow or overlfows where ever you want it/them, and as large as you want, with as many holes as you want. My 390 has 3 overflow boxes and i had 8 holes drilled. They also put the cross braces in depending on the number of MH lights you plan to use if that's what you're using.
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Click on my red house to see my 390 build thread.
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