lost's burb is a 2nd series, different than AD's .... yes it does look as if that floor has been replaced, the line behind the drivers seat is likely where the ply was split .... and yes, those front seats are from a car, not sure the burb set you got includes a drivers seat, but it might be the one in the middle of your pics with the slides attached, and the small one may be for the front passenger side
Bill
