After my wife's back surgery, our local fire chief recommended the "Sacroease":
https://www.amazon.com/McCartys-Sacr...ords=Sacroease
Expensive, but he strongly recommended. We bought one - waiting for the bone grafts in her back to heal sufficiently to try.
I also replaced the passenger seat in our Solera with one I procured online (shop4seats.com). Decent seat, but had to build an adapter plate to install, and lost front/back adjustability. Okay for passenger seat - not so much for driver's seat.