If all is well with the current truck, why not swap out to newer seats? Can find many on craigslist or at salvage yards. In my 94 rangr I installed bucket seat with electric controls for about $100. Wife siad the seat was too high so I shopped around found another set from an eddie baurer (both sides electric) for $100 and installed the electric base on the passenger side.
You can probably find the upgraded rear seats from later trucks also. dont know if you have the 4 door or a supercab, bu the stuff is available unless you really want a newer truck.