My name is Tom, also known as HD116 at Home Depot's How to Community. I am here today addressing a few product questions and saw yours.
While we do not currently carry a snow blade attachment for the 46" Ariens Hydro lawn tractor, it's 20HP is certainly powerful enough. Husqvarna makes a model that according to the Ariens tech support team, should fit fine. For your convenience, a link to the model is found here - http://www.husqvarna.com/us/accesso...
Hope that helps and thank you for your question!