Amazon.com : Soft Silicon Camera Viewfinder Eyecup Eye Cup Eyepiece Replacement for Sony Alpha A7R V A7RV A7R5 A7 IV A7M4 A7IV A1 & A7S III A7SIII A7S3 ILCE-7SM3 EVF Eyeshade Protector
KIWIFOTOS Ergonomic Long Camera Eyecup for Nikon Z50, Nikon Z50 Eye Cup, Z50 Eye Piece viewfinder, Replaces Nikon DK-30 Eyecup, Soft Silicone, 49.9X33.1X21.9mm - Newegg.com
Amazon.com : Camera Eyecup Eyepiece Viewfinder for Nikon Z7 II Z7 Z6 II Z6 Z5 Replaces Nikon DK-29 Eye Cup, Oval Shape TPU Rubber and 360° Rotatable Design : Electronics