Very first post, be gentle. Is there a custom grille or aftermarket grille choices?

 

After removing the 2 outboard screws holding the grille, you can gently move it upwards and outwards. Flip it to the back, you will see two oval air directors that hold the grille material in. It has retainers that can be released, two on the upper, two on the lower, and they will come off and allow you to remove the material. You can then use anything really. The removed material will give you a pattern, and a rough shaping that you will need if you chose your own materials. Place them in the opening, and re-attach the oval air directors.

Also see:
https://www.minagallery.com/exterior-items-6/