Thanks for the info...
I actually had searched the online stores and made similar conclusions.
I called the local stores and found that they do not carry the new (not remanufactured) axles and that they sell the same part for the 2.0L or 2.5 L engine.
I ended up buying from a local imported auto parts shop which supplies CV unlimited parts. Their catalog for mazda indicates that the parts are actually the same for both engine sizes.
Look at the following link and select mazda.