GM Genuine Parts Windshield Wiper Motor Crank Arms are designed, engineered, and tested to rigorous standards, and are backed by General Motors. Windshield wiper motor crank arms connect the wiper motor to the wiper linkage. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).