5. A good of Chapters 50 through 63 of the Harmonized System that does not originate because certain fibers or yarns used in the production of the component of the good that gives the good its essential character do not undergo the applicable change in tariff classification described in Annex 401.1 for the good, shall nonetheless be considered to originate if the weight of all such fibers or yarns in the good is not more than seven percent of the weight of that component.
6. Paragraphs 1 and 2 shall not apply to a good of Chapters 1 through 44 of the Harmonized System unless the non-originating material is provided for in a different subheading than the good for which origin is being determined under this Article.
Article 406: Fungible Goods and Materials
For purposes of determining whether a good is an originating good:
(a) where originating and non-originating fungible materials are used in the production of a good, the origin of the materials need not be determined through the identification of any specific fungible material, but may be determined on the basis of any of the inventory management methods provided for in the Uniform Regulations; and
(b) where originating and non-originating fungible goods are commingled and exported in the same form, the origin of the good may be determined on the basis of any of the inventory management methods provided for in the Uniform Regulations.
Article 407: Accessories, Spare Parts, or Tools
For purposes of determining whether a good, is an originating good, accessories, spare parts or tools delivered with the good that form part of the good's standard accessories, spare parts, or tools, shall be considered as one with the good and shall be disregarded in determining whether all the non- originating materials used in the production of the good undergo the applicable change in tariff classification described in Annex 401.1, provided that:
(a) the accessories, spare parts or tools are not invoiced
separately from the good;
(b) the quantities and value of the accessories, spare
parts or tools are customary for the good; and