OK, thanks for the tips everybody... I did find the center bottom bolt to the back back-rest portion of the rear seat, so that's out now.

The fronts are still confounding me however..... I don't quite understand what that side lever between seat and door is. I pull up on it, but can't seem to adjust the seat in any way. Seeing how it engages under the seat also doesn't seem to give me a clue as to what it actually does...!?

Are the fasteners in the rear of the front seats driven by a big philips screw head? I do see two bronz-ish looking screws up over the top of the rail/foot areas in the rear.... Is the bolt or screw head I'm looking for up over the slide-rails or from below?

Thanks again for any and all tips!