91504-ZY9-M03 Collar (8.5X14.5) - Overview. The 91504-ZY9-M03 Collar (8.5X14.5) is a crucial component designed specifically for Honda marine engine systems, particularly in rigging and accessory assemblies. It plays an essential role in maintaining proper mechanical connections and fitting within various marine system components. This collar ensures seamless integration with existing parts, maintaining optimal performance and durability by adhering to factory specifications and size requirement