A 14 pounder should fit into a #2.
That being said, unless you have an Auber model or a D model where you can run your temp higher than 250, 14 pounds should really be your max poundage for a turkey anyhow.
I don't have a D model, but many people who do have the D models or Aubers still prefer to smoke at 250 degrees and only use a max of a 14 pound bird.
I hope you will be using one of the brining recipes in the poultry section? This is pretty much a must in my book.
Good luck on your smoke.