Epson EQUITY 386SX/16 PLUS - Manual (Page 150)

Make sure the holes fit over all the pins and then push in
the connector.
4. Pick up the hard disk drive and hold it above the vertical
mounting area so the mounting plate is facing the
subassembly, as shown below.
Connectors
mounting plate
sembly
Notice that there are two tabs facing downward on the
bottom of the mounting plate. These tabs will fit into
two slots in the right side of the subassembly.
B-16
Installing and Removing Disk Drives