Roadster U-Joints
Information provided by DatsunMike to the Roadster List.

ALL Datsun models built during the time the roadsters were sold use the same U-Joints.  If your vendor does not have a listing for a roadster, try looking up listings for the 510 sedan or 520 / 521 pickup.

To improve reliability, try to purchase U-Joints fitted with grease fittings for increased life.