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I looked up the part number in the Donaldson Australia catalog it is H008154. This number is not in the US catalog and I have never seen another 4 inch besides mine. the ARM2940 number is just a retailers part number.
The people who sell these are in Australia and are not selling them on ebay right now. I do not have a part number and nothing is on the scoop but the Donaldson logo. The Donaldson catalog does not list these in 4 inch.
The donaldson ram air intake is designed to remove water from the air as it enters the scoop and has a grill over the front to keep birds and leaves out.