Proper orientation for the AR7701 is requested. It appears that the AR7701 can be installed two different ways.
All versions and serial ranges.
To install the AR7701 on a cabinet with no castors it must be installed upside down.
The AR7701 is intended to be a universal bracket that can be installed in either orientation depending on which fits the installation best. One orientation requires removal of the castors.
For illustration please see the attached file.