One thought.... In an accident where you get rear-ended the psgr seat occupant gets forced backwards into the seatback before the seatbelt contains you when you sproing forward. So, for the rearwards first bit of this you rely on the seatback not slamming backwards and you rely on the seat fixings to generally act in shear (frt ones also act in upwards tension, too) and be retained by their bolting. When you add bushings you are then asking the car floorboard fixing locations to resist both shear and resist a moment (i.e. torque). You need to assure yourself that there is enough flexural strength to resist that torque (and not tear-out, etc.) when you add-in those bushings (in that type of accident).SWMBO has a 2016. She is the daily driver but we use the car for trips. Comfy for the driver but the passenger sits too low. That seat is non power. Figured I could use longer bolts and a steel bushings to raise it a bit.
Has anyone done this?