If the sulfur content limit of a voluntary standard that met the conditions of subsection (c)(1) is subsequently revised, the organization responsible for the standard shall notify the Commission no later than 60 days after final approval of the revision. The sulfur content limit of the revised voluntary standard shall become enforceable as a Commission rule promulgated under section 2058 of this title, in lieu of the prior version, effective 180 days after the Commission is notified of the revision (or such later date as the Commission considers appropriate), unless within 90 days after receiving that notice the Commission determines that the sulfur content limit of the revised voluntary standard does not meet the requirements of subsection (c)(1)(A), in which case the Commission shall continue to enforce the prior version.