This recollection dates back to the cars of the '50s and '60s. I do not remember which makes or models of cars that had adjustable level and height adjustments. I but I do remember making adjustments on some of them. As I remember, the bench seats were mounted to the frame installed rails by four bolts, two on each side. The rails, mounted to the floor boards had three mounting holes, front and rear. By adjusting which hole the bolt went through, you could raise or lower the seat front or back by up to an inch or more.
On two-door cars, where you swung the front seat-back forward so passengers could get into the back seat, you could adjust the angle of the front seat back by installing thicker or thinner rubber bumpers on the base of the seat-back.
Now, on my 2019 Toyota Corolla hatchback SE, the passenger seat sat so low, you felt like you were in a child’s seat. I manufactured 1" blocks to raise the seat up 1". The Factory Bolts were too short for the riser and I bought Class 8 or Class 10 Bolts to replace the factory bolts. The Driver’s side had a mechanical lever to raise or lower the seat.
Now, on my 2001 Dodge Ram 2500HD, 4x4, Quad Cab, SLT Laramie Plus, has 40/20/40 Bench-Bucket Seats. These Leather Seats are 8-way Powered and Heated with inflatable Lumbar Supports in the back rest. The “20” in the 40/20/40 is a Business Console Arm Rest. Lazy Boy has nothing on these seats…