Anyone recognize these grills please?

I was wondering if anyone recognizes the grills that were used on a TV show prop that I'm trying to make. The large one is approx 22" x 82 and the oval ones are around 8" x 3.75". They may have been modified for the prop. Anyone have any suggestions please?
http://imageshack.us/a/img442/6938/12063660.jpg
http://imageshack.us/a/img850/2339/12063661.jpg
http://imageshack.us/a/img853/4918/13835951.jpg
http://imageshack.us/a/img29/8529/13835950.jpg