1. Yes, this is reposted, the first accepted seller did not have TAA compliant AC units. 2. The "wooden plank" is different in every window that has it, but that's what was used to secure the open space in the window around the AC unit. That's what will have to be reinstalled, or fabricated, to ensure that the ac units are secure. 3. that's the window opening. 4. The ac units that are currently installed are a mixture of different units and supporting brackets, there's not one standard right now. 5. No, the existing units are to be removed and disposed of. Thank you for your questions.