The USMC M60A1s in ODS were all RISE (Reliabiliaty Improvement Selective Equipment) / Passive (night sights) tanks. The USMC already had these upgraded tanks since the early '80s. They did not get them just before ODS. The Passive part has to do with night sights, not the ERA.
The M60A1 (RISE )(PASSIVE), which debuted in 1977, featured passive night vision sights for gunner and commander, a new night vision device for the driver and a deep water fording kit.
RISE improvements included several changes to the AVDS-1790-2C diesel engine in order to improve service life and reliability: new top-loading air cleaners; stronger cylinders; improved starter, fuel injection lines, and nozzles; and better turbo superchargers. A new 650 ampere oil cooled alternator, a solid state regulator and new wiring harness with more accessible disconnect were also incorporated into its electrical system.