Master Cylinder Push rod - Datsun 521/520/320 $25*
Whether running drum or disc brakes, changing the master cylinder to a dual circuit unit is a great safety upgrade. The stock push rods are not compatible with the newer, dual circuit m/c's. These have been created to use with the upgraded m/c.
The drum equipped 620 already uses a dual circuit m/c and does not require a new pushrod.