There are a lot of grille blocks in this area. Cardboard and twist ties are not rare. The most popular type is plain stainless steel sheet with a few small slits, apparently robot-cut for many popular trucks. The older classic is the more universal, overall-coverage black, quilted type with a few flaps that can be tied up on warmer days. I've yet to see any stealthy blocks - running without one here is a bad maintenance, or laziness.
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