Yamaha Collar - 90387-06M70-00. High-Quality Yamaha Collar for Secure Fit and Optimal Performance. The Yamaha Collar - 90387-06M70-00 is a precision-engineered part designed to securely hold components in place during operation. This collar ensures that your Yamaha equipment remains stable, providing reliable performance even in high-vibration environments. With its robust design and high-quality materials, it is the ideal solution for replacing worn-out collars or as part of routine maintenance