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Most pre-made are 3d printed. There is the Super, and a few on etsy. My goal is to just prevent large debris from flying in and resulting in the expensive and time consuming task of replacing the aircon evaporator – an extremely common issue for this specific model.

While you’re here you should solve the NC Miata MX-5’s common footwell water leak issue, by re-sealing the cowels screw mounts. This was gasket sealant & is still holding after 9 years.
Where the NC Miata/MX-5 Cabin Air filter should have been. The hole is 17.5cm x 9.5cm

You can see the new foam from when I had to replace the aircon evaporator – caused by this exact issue.