Plumbing advise needed

I am changing plumbing in my house. For upstairs bathroom toiltet I installed 3" closet bend with side 2" inlet vent connection. I have 3" sewer. Yesterday, a plumbing inspector told me to put 3" X 4" closet bend with 2" vent connection. He mentioned the name of the part but I don't remember. I did a google search on parts and the only suitable part I found is 3" X 4" street closet bend with no vent inlet connection. The only way I can connect the vent to closet bend is to the side of the bend. Can some plumbing expert advise me what part I need to put for toilet? Also I don't understand why 3" X 3" closet bend is not good.
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Sasha wrote:

The 4 X 3 Closet EL is probably all there is. He probably specified a 4" closet flange because that is the rule in their code.
Do you have room after the EL to put in a 3 X 2 San TEE? That would give you the side inlet for the 2" vent and I should think it would be acceptable. The TEE can even be turned up 45 deg to comply with the requirement that TEE's not be laid on their side.
Jim
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