Rhino-Rack Heavy Duty Removable Rail Mount Leg - 4 PackThe Heavy Duty CXB roof rack system is designed specifically for use with roofs that feature rails. Easy to install and remove, it features a twin bolt tightening for maximum clamping strength and easy adjustability. It also comes with security hardware to protect your racks against theft. This Part Fits: Year Make Model Submodel 2001 2013 Acura MDX Base 2001 2006 Acura MDX Touring 1999 2004 Audi A6 Base 1993 1994 Audi V8 Quattro Base 2001 2007 BMW