Xerox DP N24 System Administrator Manual page 260

Duplex Module
5 Remove the mounting bracket from the
printer.
7 Unpack the Duplex Module and remove any
packing material.
C-12 DP N24, N32 and N40 System Administrator Guide
6 Gather the Face-up Bin holder, support
bracket and screws from the original printer
packaging.
8 With both hands, position the Duplex Module
at the printer, placing the smaller hooks over
the mounting pins on both sides.