A couple of things come to mind. First would be the heater core and attached valve. Second would be the inside door panels, since the metal tops are needed to have new door panels attached to them. The third thing might be the power steering brackets, piston and valve assembly, power steering pump, lower pulley, and steering box. Everything to add factory power steering to a non power steering car. Also, save all the factory hardware, such as nuts, bolts, screws, clamps, etc..