NOS (new old stock) speedometer pinion O rings. The set includes both the small and large O rings that are necessary for preventing leaks around the speedometer pinion gear, which I also have listed in 17, 18, and 19 teeth options. The large O-ring is 1 inch in total diameter; the smaller O-ring has a total diameter of 1.5cm and an inside diameter of about 1cm.
Applicable models: Datsun 240z, 260z, 280zx (1970-1983). Also, Datsun 510 (1968-1973).