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Air cleaners are readily available on E-bay. Make sure you get one for a 4 bbl teapot and for a Ford or Mercury, not a T-bird. If you want a chrome after market air cleaner, here is a P/N for the tall filter element you will need. It comes with a foam rubber outer wrap that looks pretty good.
Purolator A63180
Or, you can do as scicala suggests and stack 2 each 3" elements on top of each other.