A photovoltaic array mounting system for a low-slope roof having interchangeable first and second bases, with a short leg extending from the first base at a non-vertical angle and a long leg extending from the second base at a non-vertical angle, wherein the short and long legs support opposite sides of a photovoltaic module such that the module is held at a non-horizontal angle, and wherein rock-in connectors are provided on top of the short and long legs permitting fast and easy system installation.