air cleaner question

[Glenn's67sd]

The 67 I'm restoring has a 67 Rochester 4bbl that takes a 5 inch gasket on the top. The air cleaner that came with the car has a base with a 4 1/2 inch opening. My question is, was an original air cleaner for this car the one with the flat base and the snokel on the lid? And the air cleaner I have, is it for a 2bbl.. I've checked on Year One's web site and they list an air cleaner with the snorkel on the base and the lid is flat. And one more question, is there a flat base out there with a 5 inch opening that I can use with the lid that I have?
Glenn