After June 30, 1989, the Board of Governors of the South Carolina Reinsurance Facility shall file an expense component for private passenger automobile insurance rate or premium charges after the rating organization with the largest number of members or subscribers has filed a pure loss component for private passenger automobile insurance with the director or his designee. Upon the approval of such component by the director or his designee, those automobile insurers designated pursuant to § 38-77-590(A), for risks written by them through producers designated pursuant to that same section, shall utilize these final rate or premium charges. Automobile insurers designated pursuant to § 38-77-590(A) are not required to use those same final rates or premium charges for risks written through their agents not appointed pursuant to § 38-77-590.