The Sport S is the newer dash and coil suspension but the 2.8 Sport S had the old dash and coils, other Sport S where the Apache and after that the Niagra.
The S after the the sport will denote the model, the name is the style
I am not that well up on A series but from memory Niagara,comes in dark green with hard shell spare wheel cover with Niagara decal also 3 spoke alloys & iI think side steps.