05' Chevy 2500hd Duramax, rear seat move forward 3'' Anyone built a box for this?

[UsAmpsFreak]

So i'm going to get the brackets to move my rear seat forward in my crew cab to be able to put a bigger box behind the seat that doesn't have the woofers pushed against the rear seat. Anyone tackled this and knows roughly how big of a box can be done? Thanks guys

Click to read more...