Amazon.com: eXtremeRate Silver Real Metal Buttons (RMB) Version Rise 2.0 Remap Kit for PS5 Controller with Gray Rubberized Grip White Back Shell, Upgraded Programable Back Buttons Attachment for PS5 Controller : Everything
Another way to have the back buttons on the dualsense edge controller is to flip the paddles around found it quite comfortable : r/Dualsense
PlayStation DualSense Edge: Sony Unveils High-End PS5 Wireless Controller - Bloomberg