91504-ZY9-M00 Collar (8.5X14.5) - Overview. The 91504-ZY9-M00 Collar (8.5X14.5) is a precision-engineered component essential for maintaining optimal function within Honda marine engine systems. This collar plays a crucial role in securing and interfacing parts, contributing to the smooth operation and reliability of your marine equipment. Crafted to exact factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. O