I have some seats that have seen some better days in my 69 vert. The driver is much worse than the passenger. I have priced seats and they are EXPENSIVE. I think the frame may need to be replaced, but definitely the springs. Foam you may ask... was that an option for my year?!?!?! You mean I am not supposed to feel the springs gouge me?!?!?
Since I am the only one who rides in the car, is it geometrically possible to switch the passenger and driver seats? It is just a thought, so keep the heckling to a minimum!!!