jtd123,
I have the bestop seats and really enjoy them. It was pretty easy to mount them but it did involve drilling some extra holes. I used the same sliding bracket as SC74 and also used a summitt fixed bracket for the passenger seat.
Picture 2 shows the passenger seat with a summitt fixed bracket (turned sideways) in the rear and the stock seat mounts in the front. I had to drill two holes for the fixed bracket to work. The stock mounts were used in the original holes.
I don't have a picture of the driver seat but all I did was use the sliding bracket and mount it to the seat and then directly to the floor. I tried using the fixed bracket with the sliders (like the directions say) but it sat a little high for my taste (though it was still lower than stock). I drilled four new holes to mount the seat---but if I remember correctly I could have used the stock holes---I just wanted to be able to adjust the seat more. If you are not very tall and want to use the stock holes it just makes it that much easier to install.
The rear seat was also easy to install. I did buy some bolts at home depot and welded them to the seat where they latch onto the wheel well---to keep the seat from flipping forward.
Good luck!