Model Using Modules in Rails Application

I have a model that requires loading external data from an auxiliary source. A number of web services exist that my model can fetch the data from (swappable), but I don't want to create code that will make it difficult to change services (costs significantly differ based on variable and fixed usage and it is likely changing will be required).

I would like to create a driver to perform the interaction (and then create further custom drivers if the service requires switching). Unfortunately, due to the tight coupling of the driver and model, it does not makes sense to extract the code into a plugin or gem. I have extracted all the code into a module (see example), and currently have the code declared above my model.

module Synchronize
  def refresh
    self.attributes = ...
    self.save
  end
end

class Data < ActiveRecord::Base
  include Synchronize
end

Does Rails (3.0.0) have a convention for storing modules tightly coupled with models? Should I be using a plugin to do this? Is this associated with the 'app/helpers' directory? If not, where is the most appropriate place to store the code? Thanks!