Fabrication Bungs & Tabs for Metric Motorcycles. The Metric Fabrication Bungs & Tabs collection at TC Bros is essential for custom builders who demand precision and reliability when fabricating their metric motorcycles. This category features a wide range of high-quality weld-on bungs, mounting tabs, and brackets designed to simplify the customization process while ensuring durability and a perfect fit. Ideal for models like Yamaha XS650, Honda CB750, and other metric classics, these components are built to support everything from custom exhaust mounts to tank and fender brackets. With TC Bros’ commitment to quality and ease of use, these fabrication parts provide the foundation for creating a truly unique chopper or bobber with attitude.