GM Genuine Parts Windshield Wiper Arm Park Ramps are designed, engineered, and tested to rigorous standards, and are backed by General Motors. Windshield wiper arm park ramps keep the wiper blade from sitting on the windshield for too long by pushing the wiper blade up and off the glass, which relieves pressure and helps prevent unnecessary wear. 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).