13520-ZW5-000 Gear Case Spacer - Overview. The 13520-ZW5-000 Gear Case Spacer is a vital component in Honda marine engine systems, primarily used within the gear case assembly to ensure proper gear alignment and smooth mechanical operation. It plays an important role in maintaining the structural integrity and functional reliability of your outboard motor's lower unit, ensuring seamless integration with existing parts and maintaining optimal performance and durability.. Key Features. Precisely engineered spacer that supports the gear case assembly.. Genuine OEM Honda part built to factory specifications and tolerances.. Ensures correct gear alignment which aids in efficient power transmission.. Designed for clean integration with surrounding hardware and seals.. Contributes to the overall durability and smooth functioning of the marine gear system.. Essential for preserving performance consistency in Honda outboard motors.. Why Choose Genuine OEM. Using original Honda parts like the 13