Custom Seats for Metric Motorcycles. The Metric Seats collection at TC Bros is designed for riders and builders who demand comfort, style, and rugged reliability for their custom motorcycle projects. This category includes premium solo seats, seat pans, and mounting kits, all engineered to provide a perfect blend of functionality and bold design. Perfect for models like Yamaha XS650, Honda CB750, and other metric classics, these seats are ideal for creating stripped-down bobbers, stretched-out choppers, or any unique build that reflects your vision. With TC Bros’ focus on craftsmanship and rebellious design, these seats ensure your ride not only looks killer but feels great on the road.