I put 2000 model seats in my '86 K10. Entirely different due to the saddle gas tank humps in the pickups so not much help to you, but may be to someone else.
The seats are honestly a bit tall in a pickup. I even removed the sliders to lose some height, it works fine but its still a bit taller than I'd like (that said, I fit under the steering wheel fine and I don't bump my head or anything).
My seat adapter/interior roll bar ended up rediculously complicated, but it works pretty well. It catches most of the original seat holes plus 8 studs welded to the back rail and the two B pillar seat belt holes.
The weird loop in the center goes in between the gas tank humps to keep it as low as possible.