Here's a bench seat into a 1965 FJ45. Project requirements were:
-seating for 3
-shoulder belts
-more comfort than the old seat.
The last part was easy. The shoulder belts were the tricky thing. There is no place in older FJ4x for a shoulder belt attach point. So a seat w/ built in shoulder belts is required. That narrowed it down to a few cars & trucks. The truck seats were measured and found to be to tall/thick/wide for the FJ45(we wanted to have some open storage space under the seat).
Eventually, the donor seat was a ~2000 buick century. Grey color that went w/ carpet already in the truck, leather for comfort, power adjustment every which way for ease of fit, shoulder belts, seating for 3, and a bonus center armrest w/ 2 occupants. These particular seats also had heaters, but we didn't get the dash switches, so they were not hooked up. Truck lives in a warm climate anyway.