I think they are just guesses, the LTD also being one, as that style went from 1982-86, no way to tell 1985 specifically.
The Impalas are both 1981-85 models
The Pontiac is actually a Bonneville from 1977-79
The Tempo is an 1984-86
The Mercury Gr Marq is a 1983-85
And the Olds Cutlass is a 1982-1986