I bought standard 1/4" mesh screen from Home Depot and wire tied it to the inside of the grill before doing an Alaska trip last summer. I didn't want to chance a rock damaging my radiator. It works great and you don't see it from the front unless you are really looking. It also stops most bugs and birds and it is easier to wash off with my pressure washer than the radiator. Total cost was under $20 and took me about an hour to crawl under the front, cut the mesh and tie it in place. Does not affect cooling at all.
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