Yamaha Collar - 90387-061K9-00. Durable and Reliable Yamaha Collar for Secure Fit. The Yamaha Collar - 90387-061K9-00 is designed to ensure a secure fit for your Yamaha components, preventing unwanted movement and securing parts during operation. Constructed from high-quality materials, this collar offers both durability and reliability, making it the perfect solution for your Yamaha equipment. Ideal for use in demanding environments, it keeps your parts in place even under high-vibration condit