Great advice. Thank you.if there gone make sure to look over the WHOLE rest of the fire wall / wiper cowl area good before going down that rabbit hole . only thing to rust them out is the water drains plugged up for years and held water . if there gone the rest of the fire wall area could be just as bad or worse .
Thank you for the info.Called Plenums in factory manuals
The lower part is reproduced called cowls. That’s all I’ve seen.