The H3 Aluminum GMC Savana Roof Racks from Vantech have a low profile and aerodynamic design that secure to existing drip or gutter rails on 1996-2013 GMC Savana vans. 8" wide mounting bases contain two eye hooks for tie down straps (not included). Rubber seats (included) provide a buffer between the mounting bases and drip rail clamps, eliminating metal-on-metal contact. The aluminum roof bars are available in a set of two or three with a black or white powder coat finish. Extruded aluminum construction features channels for installing and adjusting accessories. Accessories are installed via sliders (included) securing within the aluminum channels. Included end caps prevent wind noise and water build-up. The H3 Aluminum GMC Rally Wagon Roof Rack from Vantech has a clearance of just 7" in height!