I was told that this was pulled from a late 80s F150 pickup.

 

I agree looks like a 1980's ish SC front bench. It should work, do you have the original sliders from the 78 SC? Just in case the one's on it do not work/fit? Take the 78 ones and put on the bottom of the new seats frame.

 

The previous owner put a GM front seat in and tossed the seat and tracks with it. I am crossing my fingers this one will work with the existing seat tracks.