Yes this is a mini arm (3.5")
If you're committed to 67d then yes, you'd have to piece it together separately. Otherwise - here is an alternative
https://getoffroam.com/collections/jeep-products/products/jeep-wrangler-gladiator-phone-mount-kit
Here is the Offroam Clamp...
I recoded a video a few weeks back to show how much flow and adjustment range you get.
You basically have to choose between having the air go in the upper portion of the cabin or the lower - depending on how you mount the clamp. Since RAM, 67d and others offer arms - you can move the phone out...
Vector Offroad is awesome, esp if you have a lot to mount (phone, Garmin, GoPro, tablet, Overlander nav, CB radio, etc)...
I run only Garmin+Phone on my trips and don't want to block the view, or drill your new Jeep, or put sticky tape on it.
So recently came up with a mount with a rubber...
I am also not a fan of blocking the view or drilling or putting sticky tape on my new Jeep.
Here is a solution I came up recently with that's compatible with all AMPS holders out there (RAM, 67d, etc..)
https://getoffroam.com
Air vent retains most of its airflow and you can still aim it too...