HPE ProLiant DL360 Gen11 User Manual page 83

The rack rail option support is dependent on these two factors:
The height and weight of the chassis as determined by the front- and rear-end server configurations.
The depth of the chassis as measured from the edge of the front panel (without the front bezel) to the edge of the rear panel.
To ensure compatibility between the rack rails and the server, verify that the rail number labels on the chassis match the ones stamped
on the rails.
Rail number labels on the chassis
Rail #3 and #5
Rail identifier stamps on the inner rail of the friction rack rail
Rail identifier stamps on the mounting rail of the friction rack rail
HPE ProLiant DL360 Gen11 Server User Guide 83