40201-ZZ5-010ZA Case *NH282MU* - Overview. The 40201-ZZ5-010ZA Case *NH282MU* is a critical component for Honda marine engine systems. This extension case supports the lower unit system, ensuring proper alignment and housing of essential mechanical parts. Built to OEM specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM Honda extension case designed specifically for Honda 40-50 HP outboard marine engines..