I'd bet the same as Squirrel. Looks like a GM to me. With the Vinyl on it, I would guess it'd be a truck. Not many cars had 100% vinyl on them like that.
If you pull it out, there is usually a metal tag attached to the seat bottom springs. most split benches were 2 dr cars. It does not look Ford, so GM or Mopar is what I'd go with too. Measure the seat backs, the hardtop ones are shorter than sedans.
the full vinyl is just a cover, you can see some of the original upholstery where the dark cover is torn
HotRod-Linkin is as close as I could guess, also. The track tells me its definitely GM car, late 50's-early 60's.