AggAuto Universal 40"x13" Car Grill Mesh - Aluminum Alloy Automotive Grille Insert Bumper Rhombic Hole 3x6mm
I used it for another build and had plenty of leftover, I cut a piece and screwed it to the fan, I used Gorilla Glue double-sided tape to hold the screen in so I would have to make the holes for the fan.
https://www.amazon.com/dp/B08PBF1SLJ?psc=1&ref=ppx\_yo2\_dt\_b\_product\_details