This upgraded air dam for the 1970-1974 Datsun 240Z and 260Z is made of hand laminated fiber-reinforced plastic (fiberglass).

Will fit the 1975-1978 280Z, but will have to be modified to work.
It will fit, but the bumper sticks out quite a bit and the parking lights holes will have to be filled in the air dam or place another set of early 240/260 lights. The lights on the 77/78 280z are located in the front grille.
Possible to be made in carbon fiber.