They don't even look like FoMoCo seats...
Remind me of GM seats, but the covers may not even be stock.
Anyway, they are nothing like Ford seats of the 69-74 era.
Remember that if someone used their head and bolted on FoMoCo seat tracks, they could be from anything and still bolt right in.
Edit: Looked at the pic a little closer.
The covers are not a Ford style or shape at all, but I suppose there could be a Ford seat frame underneath. They appear to fit really loose on the upper half of the back, so looks could be decieving.
They may be the original covers for those seats, but they look too cheezy to me to be stock from any mucsle era car.