Datsun Roadster Wiper Arms from Rallye Enterprises, Ltd.

68-70 WIPER ARM AND NUT INFO...Type "A" and Type "B" There are two types of original wiper arms for the 68-70. They are interchangeable as long as you have the correct matching retaining nut. Type "A" is retained on the post by a nut that has smooth sides; and the wiper arm itself has no threads internally. Both "A" and "B" types screw down on to the pivot stud on the car. The type "B" arm has threads inside it (see arrow); and the matching nut has threads on it's outer side (see arrow). This is designed so you can unscrew the nut to remove the arm but the nut doesn't fall off and get lost. You can remove the retaining nut by continuing to unscrew it past that point.