A post mounting system includes a post and at least one device for mounting to the post. The post includes a first elongate flange and at least one other elongate flange projecting from a proximal edge of the first flange. A portion of the first flange is deformed to facilitate mounting of the device. The device is located at a given position along the first flange. Upon being located in the given position, the device interacts with the deformed portion to resist lateral movement away from the first flange. The device can include a body and projections that define a recess. Remote ends of the projections are spaced from each other by a distance that is less than a lateral width of the deformed portion. The device can be positioned onto the post and receive the deformed portion in the recess to enable mounting of the device.