How to mount a 3.5 HDD to Inspiron 3020 case?

The hard drive will be mounted directly to the chassis below the optical drive.  If you purchase retail boxed HDD, it will come with cable and mounting screws.  If purchasing bare drive, you will need to source SATA cable and 4 x 6-32 mounting screws.  This is the service manual with instructions and location for installing the hard drive  https://www.dell.com/support/manuals/en-us/inspiron-3020-desktop/inspiron_3020_sm/installing-the-hard-drive?guid=guid-6526b0e0-8be9-473a-97d5-207621ae0925&lang=en-us

1. Connect the data cable and power cable to the hard drive.
2. Place the hard drive onto the chassis and align the screw holes of the hard drive with the screw holes of the chassis.
3. Replace the four screws (6-32) that secure the hard drive to the chassis.
4. Place the computer in an upright position.