87121-ZV1-F00 Mark Rr. (5) - Overview. The 87121-ZV1-F00 Mark Rr. (5) is an authentic Honda OEM part used primarily within Honda marine engine systems. This rear mark functions as a critical identification element, supporting exact system recognition and aligning with Honda's rigorous standards for marine parts. Designed to maintain reliable operation, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. It is a genuine OEM component