Modify to your liking:

Import to Fusion 360, select "Change Parameters" from the "Modify" menu.

Hole_Diameter: Changes the screw/insert hole diameter. Adjust based on screw/insert size.

Hole_Spacing: Adjusts the space between the screw/insert holes. Model will adjust and center the DIN rail clamp between the holes.

Bracket_Width: Changes the overall width of the bracket.

Bracket_Thickness: Changes the overall thickness of the bracket. Adjust based on the depth of the screws/inserts you will be using.

Model should be fully parametric, where adjustments to the above parameters will scale the model appropriately. If any issues arise please comment and a new version can be uploaded to correct them.