As im sure all of you are aware, the cowl vent panel clips tend to break easily and are hard to come by. I didn't want to try and machine my own so i 3D printed a set of screw retainers that will fit into the existing square holes and retain a #8 pan head screw. They were based on an old mopar concept (among others) that did the same thing, open on the sides and you simply squeeze them until they fit in the square hole and then let them go. the small lip keeps them from coming out but also very easy to remove.
I printed them out of ABS so they are pretty tough. If anyone wants the STL file, CAD model, drawing or a set just DM me.
On mine, they tightened down fine and are still holding strong.
Some images below.
I used a windshield rest here just to show how they function since you cant see them under the cowl vent panel.