Have you looked at replacing the seats out of a later model? I have a 94 ranger, had the 60-40 seat. I got power seats out of a later model explorer. The wife complained that the passenger seat was too high. found a wrecked eddie baurer with all power and added it to her side. Power windows from a rolled 97-98, mirrors all the nice stuff, but nothing fancy. painted the plastic to match the original.
Its something to think about, but dont know what the issue is with the seating. My sister drives one in the same vintage, but her problem is the door hinges are worn out now and they still dont get around to fixing them. Its here DD and travel vehicle!
BTW my ranger has 320000+ on it and runs like a champ. Getting lazy and too old and creaky to roll around under it anymore so found a little indy shop and use them as they are quicker with the repairs than I can be and labor is not much.