Bracket for fitting an 2.5" SSD into a Dell Dimension 5100, which requires a special no-screws disk caddy for inserting 3.5" disks - see photos.

OpenSCAD code enclosed. It's highly parameterized and reasonably well commented, so you can easily adjust any of the params to suit.

Note that we had to snap off the front plastic retaining piece from the Dell holder, because it blocked access to the connectors at the front. Simple fix, using mole-grips.

In the final installation, we pushed the SSD to the left somewhat (see DISK_OFFSET_SIDE param) to avoid other obstructions and line the disk up with the SATA cable.