I've been slowly changing mine over for the past 2 months since she isn't my winter driver.
Got the pieces off ebay from a salvaged max. If you find one to buy make sure you get the large metal bracket for the seatbacks to mount to. (2 pieces. A long rod and rectangle plate) Mine didn't come with the center back because it was somehow damaged. There are also some trim pieces on each side which they had lost.
I'm fabricating some subwoofers between the seats in a sealed box, and will fab something for the sides later on.





Wiring is a pain. but coming along.