Even though I have lived in Ohio for 30 years, I still consider New York as my home town! Naturally, I would root for whatever team is from New York!
Anyway, to respond to the inquiry for chrome wing nut...when I searched on EBay Motors, My search words were "chrome wing nut for air filter", there was a long list of those with the air filter assembly...but if you scroll down you will come across several chrome wing nuts as well as customizedwing nuts. the cheapest was for $3 bucks and some odd cents as it was marketed for a Corvette. It looks like any wing nut to me, and probably would fit. There was another simple basic chrome wing nut for a pricey $24 bucks. It may be based on a better metallic base other than pot metal...your guess is probably better than mine. Good luck!
Another idea that I haven't checked would be Jegs in Columbus, Ohio.
Happy Motoring!
Dan