There is an older thread on the Procar seats already; let me see if I can find it.
72 FJ40 Procar Seat Install - https://forum.ih8mud.com/threads/72-fj40-procar-seat-install.1248187/
Info on Procar seat brackets for 70 to 73 40 series -...
ProCar makes some nice and reasonably-priced seats. Many (myself included) like the ProCar 90 seats because they look close to stock seats but have much firmer foam and recline/fold forward.
Procar Pro-90 Series 1300 Seats - Free Shipping on Orders Over $99 at Summit Racing -...