Half-Sized Under Seat Storage?

[USMCsilver]

I've got the OEM storage bin with lids that spans the width of the truck, but I'm wanting to put my JL Audio box under the seat. It's just a single 10", so I don't need a lot of room.

I was wondering if anyone is familiar with a storage bin system that just takes up half, or a 60/40 type split.

Thanks!