Lexus LS430 sub woofer replacement and interior removal

2020 update: Sound test video here:    • 2005 Lexus LS430 Sound test for SPL/d...  

A step by step tutorial on how to remove the back seat & rear interior garnishes of the Lexus LS430 to get to the sub woofer, and how to replace it with a cheaper aftermarket part.
The OEM part 86160-0W260 is ~$400. I installed this replacement Polk Audio DB840DVC for ~$50 in ~4 hours.
Important notes:
- I am not a professional mechanic or electrician, so consult a professional if you don't know what you're doing.
- There's lots of conflicting information out there on Ohm/resistance of the Mark Levinson sub woofer and the best way to re-wire a replacement. In this video, you can see mine measured around 12 Ohms, so I wired the Polk voice coils in series to get 8 Ohms. If this leads to problems down the road, I will post an update.
- I didn't think about making a video for this until after I had taken everything apart, so this video was mostly filmed backwards. If you see any continuity mistakes or confusion, that's why.
- There may be better ways to wire & mount a replacement sub woofer in this car; this is just one of them. Please leave a comment if you have any suggestions for others to help them do a better job if they're about to undertake this.

Thanks for watching & reading!