Need help to ID old bench seats

Found these in garage rafters at estate sale in Tustin CA. Took them to a parts yard but could not ID. Wondering if they're from a truck since the back of the seatback is not covered. Cushions are lined with burlap, seat bottom also uses foam, no cut-out for driveline. Seat bottom has metal loops on ends as seen in pictures. Any help identifying would be appreciated. Thank you.

The seat back is 42L x 21w x 4h. The seat bottom is 41L & 39L (widest point and narrowest points of length) x 20w x 7h.

I'm going to say the backseat out of something American fro the late sixties or early seventies.

Agreed with back seat statement - definitely a sedan or coupe, not a wagon, based on the open back. Lack of a trans tunnel and width would have me thinking full size 4 door, not a coupe like a Mustang or Camaro.

Yes, back seats makes more sense given the open back. Thanks for the comments so far.