New L2 R2 Extended Triggers Buttons for PS4 Game Controller 1Set D | eBay
Need more buttons? The PS4 Back Button Attachment has you covered
Amazon.com: eXtremeRate Carbon Fiber Dawn Programable Remap Kit for PS4 Controller with Upgrade Board & Redesigned Back Shell & 4 Back Buttons - Compatible with JDM-040/050/055 - Controller NOT Included : Electronics
How to FIX PS4 Controller Sprint Not Working (L3 Button Fix)(New Method) - YouTube