There are exempted from the provisions of this chapter and the tax imposed by it, gross receipts from the sale of the following:
(1) Parts and repair services on farm machinery, attachment units, and irrigation equipment used exclusively for agricultural purposes which are exempt from the tax imposed by this chapter pursuant to § 10-45-3.5, if the part replaces a farm machinery, attachment unit, or irrigation equipment part assigned a specific or generic part number by the manufacturer of the farm machinery, attachment unit, or irrigation equipment; and
(2) Maintenance items and maintenance services used on farm machinery, attachment units, and irrigation equipment used exclusively for agricultural purposes which are exempt from the tax imposed by this chapter pursuant to § 10-45-3.5.