3rd row seating for E53?

[PMPNX5]

I've tried searching this, but can't find anything close to it. I can't believe I would be the first one to ask this, but here goes....

I understand that BMW didn't offer 3rd row seating until the E70, but are there any aftermarket companies that make a 3rd row seat for the E53?

I know there are no dugouts in the cargo area "floor", but there's certainly enough hooks and loops back there that someone must have come up with a concept for it, no?

Thanks in advance for any help. Rob