Yamaha Mat, Step 1 - F6D-U351H-10-00. OEM Step Mat for Secure and Comfortable Boarding. Enhance both safety and comfort on your watercraft with the Yamaha - Mat, Step 1 - F6D-U351H-10-00. This genuine Yamaha replacement step mat is engineered for optimal grip and durability, offering a secure foothold in high-traffic boarding areas. Whether you're stepping aboard after a swim or transitioning from dock to deck, this mat ensures confidence with every step.. Made from high-quality marine-grade mat