Those plastic cowl grilles may be aftermarket as mentioned, but I am thinking they were factory on some BOP cars. In my junkyarding days of the late 80's, I would find them on many A Body Buicks or Pontiacs. It's possible they were aftermarket, but I saw so many and even on run of the mill 4 doors, wagons, etc., I am thinking they were factory, maybe only on certain years. I agree, I never saw them on Chevelles; and Cutlass of that era usually had the "metal hardware cloth/window screen" piece attached with sheetmetal screws.
A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more!