Project 440DD

Hi, I just picked up power bucket front seats from a 2017 Pacifica that are going into a 1975 Duster. I kkoiw I'll need to modify the rear legs as they are not flat (front are flat).
Any hints / watch-out's / suggestions / etc. you can share regarding the installation process? Did you utilize the bucket seat floor brackets (Seat Brackets | AMD 407-1067-S) if there was a bench seat previously? Thanks for any advice you can throw my way as I get ready to do the swap.
No I didn’t use any off the shelf brackets. My floor pan isn’t to factory contours either.

I did modify the challenger seats to sit about an inch lower but they’re still too tall. The power motor is huge