Is this a fair radiator?

Speaking of shrouds . I changed the bulbs in the headlights on my 2014 ram . I got to thinking about the upper radiator sealing flap , that keeps air from going over the radiator, completley enclosing the gill area to force the air thru the rad. , I`m thinking that it would help our old cars to do that, and would be better than my home made front seal trying to seal my fiberglass hood.
Gonna make one when I run across the right material.
Need about 67 x 6 1/2'' of something, preferably black and slightly flexable , and of course lite weight .-------------????
Would be another interesting experiment ..

Uh, they already make those. These cars came with them from the factory.
Mopar A Body 67-76 Hood to Cowl Seal with SS Clips Dart Demon Duster DMT | eBay

Mopar A Body 67-71 Hood to Radiator Support Seal & Black Plated SS Clips DMT | eBay