HP A10500 Series Manual page 17

Figure 6 Locate the position on the rack for installing the slide rail
(1) Middle of the narrower metal area between holes
Install six cage nuts on the square holes on each rack post, as shown in
3.
Figure 7 Install a cage nut
Align the installation holes on the front end of the slide rail with the cage nuts on the front rack post,
4.
and fix them with screws, as shown in Figure 8.
14
Figure 7.