Blown63

Does anyone know what size the connector for a cf air intake needs to be? Mine came with these ugly blue connectors and I want to order black ones but I am unsure how wide they need to be, I am assuming its either 3" or 4" inches. FYI I am talking about the blue piece in the one picture and the part circled in red in the other. Any help is appreciated.

Thanks
George

Blown63

Can anyone help?? Please