1985 Savanna RX-7 Dealership Options & Accessories Catalog, they are lightweight but are also "directional" wheels. Infront of each hole the wheel surface tapers in to direct air to the brakes. Highly functional but not fashionable, very low sales led to them being discontinued not long after.
Size is 15 x 6.5 price when new = 35 000 yen per wheel.
For the BBS wheels, size is the same 15 x 6.5 but price = 53 000 yen per wheel.
