Just an FYI, the Super Stock cars never had sliders as the seats were fixed. The S/S seats also fold forward.
I have a pair of fixed A100 seats from a driver's ed module, they have those sliders as well. Like the pic above of the seat bottoms, the holes in the seat frames did not line up with the pre-drilled holes in the S/S seat brackets. The original bracket holes on my seat frame bottoms were also offset to one side (as above) so I had to drill new holes in the frames to get the brackets aligned with the factory holes in the floor. They are A100 van type seats but 100% not Super Stock seats.
Also, if you use the sliders with the seat brackets, it may end up putting the seat too high depending on your application. In my A body, I tried to install the seats with the sliders (using the factory seat mount holes) but my head would be up into the headliner. If I had a helmet on it was almost to the roof. Even without the sliders, I still had to move the seats back on the floor from the original factory holes. May be different on a B body though.