It took some mauevering and a lot of cussing, but I shoe-horned in a pair of APC racing seats in my '96 standard cab. Custom brackets had to be made, and they ride much higher than the stock seats (due to the thickness of the cushion). The headrests just barely clear the headliner, and there is even less room for the 10" Sony's behind them.....
....but I love'em!!
Totally comfy on long runs, and do provide support when in the curves. I debated a 4-point harness, but concluded that it would be a big pain in the...neck to have to wrap them every time I drive.