Try a pair of late seventies early eighties bronco II seats. Extremely comfortable. Lots in junkyards. They can work as either a bench or individual buckets, some of the later ones can be electric, the passenger seat folds forward and slides about 18" to allow great access to the back seat. they are exactly the right width. The only problem is that the floor of the bronco is not flat so you have to make a little angle bracket to bolt the seat down. Try em. You'll like em.
.john