Be careful - Big Agnes Accessory Vestibule-Big House

I bought this vestibule because the photo on the website looked like my tent. The photo was not for the item delivered.
After attempting to setup the vestibule on my tent, it was obvious that it would not work. I called Big Agnes to discuss the issue. Thanks to the very helpful assistant at Big Agnes, the problem was discovered. It turns out that this particular vestibule is for their 2017 model of the Big House 4 tent. My tent is the 2016 model. Big Agnes made changes to the tent and the vestibule for 2017.

How do you find out what model Big House 4 you have? There is a small tag (1"x1") just inside the door on the right side of the tent (next to a very large tag). A number on this small tag starts with "Y". The number following the Y (17, 16, 15, ...) gives the model year. There is also a small tag on the inside of the front panel of the vestibule. It will also have a "Y" number.
So if you need a vestibule for a pre-2017 Big House 4 tent, the new vestibule will not work. Without looking at the tags I don't know how you are supposed to get a compatible vestibule.