One of my wiper arms raises to a vertical position and parks there. Two don’t. What seems to be the difference is the “hump” at the hinge and the ability for the arm to rotate over the hump and park. Other than that, all three arms look identical and I believe they are original.
Should the arms park vertically? Easier to clean the windshield and exercise the wiper mechanisms.
Vertical pics first, non-hump pics follow.