This model is designed for these kinds of SD to IDE adapters that you can find for cheap everywhere.
Use some sort of double-sided adhesive to secure the adapter to the mount as it otherwise isn't held in by anything.
The holes in this model are in the same places as a 3.5" floppy drive, not a hard drive. You will need to use M3-0.5 screws (standard for 2.5" drives, floppies, and 5.25" drives) instead of the #6-32 screws that you would use on a 3.5" hard drive.
I've provided multiple variations. The “shifted” models have the adapter moved to the right to give more room for the floppy power connector. (Molex won't fit at all.) If you solder wires to the adapter like I did, you can use the centered version.
Within these variations, there is a version with 3.88mm holes designed for the M3 H4 heat set inserts from this set, and a version with 2.6mm holes designed for directly being screwed into.
CAD files are provided if you need to make any changes.
Print settings: I used standard PLA with no supports.
The author marked this model as their own original creation.