Classic Auto Air Installation 74 Dart Sport

Now I am hooking up all the interior wires and installing the vent hoses. Dang it gets kind of crowded up under the dash. Ran into a problem with the defrost vents. The adapters they give you in the kit to attach the air hoses to the vents are to small in diameter, they wont fit the vents. I didn't use the adapters, I simply inserted the air hose all the way into the defrost vent, drilled two tiny holes through the vent neck and into the hose and secured with tiny sheet metal screws.