Air Filter Snorkel / Tube

Where do you get these ? Mine rotted out. Just ordered my sun visor decal well not the aftermarket crappy decal but the correct cloth type from fleabay.







https://2img.net/h/i296.photobucket.com/albums/mm193/gsdvador/78-camaro-engine1_zpsh5pbhaeu.jpg

Rockauto teases u they have the part listed ,they let u add it the when u go to pay it says part is unavailable and was removed from cart
I tried to use the part# to find a same/similar part and I found nothing

However I was thinking of using a silicone coupler (4x6 to 4" ) for Ford style throttle body
Then run 4" piping to a cone filter hiding behind the grill
Ideally I'd use the 2 snorkel air cleaner that the Canadian models carried
One of the members posted a pic from his 78 bel air