https://www.etrailer.com/roof-2011_Mazda_3.htm
Today on our 2011 Mazda 3, were going to be test fitting the Yakima Whispbar System using the three bars, part number WB-S16 and the Fit Kit for this vehicle, WB-K451. The first thing we need to do is remove the fix-point covers. There are two on each side of the vehicle. Next we need to install our grub screws. On this Mazda, well be using the 60mm grub screws. These are the shorter ones included with the fit kit.
Note: Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.