a) The requirements found in § 17.23 relating to painting and lighting of antenna structures shall not apply to those structures authorized prior to July 1, 1996. Previously authorized structures may retain their present painting and lighting specifications, so long as the overall structure height or site coordinates do not change. The Antenna Structure Registration re- quirements found in § 17.5, however, shall apply to all antenna structures that have been assigned painting or lighting requirements by the Commis- sion, regardless of prior authorization.