Amazon.com: Teak Tuning Bubble Bushings Pro Duro Series in Red - Loose (61A) - Custom Molded Fingerboard Tuning : Toys & Games
Amazon.com: Polyurethane Rod End Bushing Kit for Custom Builds, Fits 5/8 Inch Bolt, 3/4 Inch Thread 4-Bar Ends, Includes 8 Bushings and Sleeves, Durable Steel Sleeve, Ideal for 4-Bar Ends and Rod