Make sure the rail label faces the inside of the rack. Align the rail flange inside of the rack flange. Position the rail-location pegs fully within the rack holes.
Figure 1: Front of the rack and rail-location pegs
 
 | 1 Rail-location pegs | 2 Front rack post | 
Figure 2: A Phillips 13mm head hex flange screw and the front of a rack
 
 | 1 Phillips 13mm head hex flange screw | 2 Rail-location pegs | 
Figure 3: Extended rail to the back of the rack
 
 | 1 Back of the rack | 
Figure 4: A Phillips 13mm head hex flange screw and the back of a rack
