1969 camaro AC middle Duct /Dash

[hdptsr]

Hello, I am putting a 1969 camaro together and am trying to figure out the placement of the middle AC duct as it exits the dash.  I will attach some pictures.  I am a bit confused as the dash opening is not large enough for the duct to come through.  I know the vent piece will fit into it, just not sure this is right?