New Original Engine Management brand distributor cap,part number 157-783 or 4915, made in Japan.  This fits:

• Chevy Sprint 1.0L 1985-1988
• Pontiac Firefly 1.0L 1985-1988
• Suzuki Forsa 1.0L 1985-1988
• Suzuki SA310 1.0L 1985