5. Notwithstanding subparagraph 2 of the first paragraph of section 4, an optional component may be substituted for a basic component of a device where the former appears in the description of the device under the heading “Component(s) and Supplement(s) Available” or on an exclusive list of components in the Tariff.
O.C. 612-94, s. 5; Decision 001-2009, s. 4.