Canon ET-118 Lens Hood (300mm F/2.8 L NON-IS) | eBay
Canon ET-118 Lens Hood (300mm F/2.8 L) at KEH Camera
Canon ET-161 II Lens Hood for EF 600mm f4 L USM Lens ( 1st Gen/Non IS) | eBay
Amazon.com : Fotasy Metal 49mm Lens Hood, 49 mm Hood Shade, Compatible with Standard Prime Lense with 49mm Filter Thread Diameter, Screw-in, with 58mm Lens Cap : Camera Lens Hoods : Electronics
Camera Lens Hood ES-62 Thread Mount For Canon EF 50mm f/1.8 II 52mm Lens - AliExpress