How to connect these defrost hoses

I have not found this to be the case at all. Working on a 74 Dart Swinger Factory AC car. The outlet from the box and the plastic dash vent are the same. I placed the original vent over the box outlet and they are the same diameter. I got a pair of aftermarket vent hoses (and adapters) to replace the original vaporized paper ones. Garbage total garbage. The adapter doesn't fit inside the vent or box outlet, the hoses don't fit inside the adapter, what a load of trash. I expect to have better luck and a closer to factory install by using either dryer vent or the flexible heat riser tubes from the auto parts store. Any time an aftermarket part comes with an "adapter" the original didn't have, you know it's trash. Sending the pile back to Classic Industries.