If you need a seat, and seats are not easy to find, eventually you'll pay more than you expected/wanted to pay.
No one has yet posted a satisfactory substitution for the seat cushions. Has anyone used school bus seat frames/cushions? Please post links to pictures.
A satisfactory substitution for the middle and rear seat frames has been posted - a member makes them. Maybe someone who has actually bought these custom-made frames will post their experience and post links to pictures of the seat frames installed?