I didn't even know you could get ones fitted.

I've been referred to the LC at the hospital already so they will make an effort to come and see me once on the ward. And once I'm able to I will attend the hospitals educational class. I've watched lots of videos on attachment and book marked them so I can rewatch on my phone / laptop if need be.
The LC should be able to make sure you have the correct size/shape for you. Its hard because I doubt anyone would have a set of all available to make sure you have the best fit for you. I will see if I can find anything to link you too that will help you with making sure you are getting a good fit.