Amazon.com: eXtremeRate Transparent Clear 2 Pairs L2 R2 Buttons Extention Trigger for PS4 Controller, Game Improvement Adjusters Extenders for PS4 Controller JDM-030 : Video Games
Amazon.com: Bionik Quickshot - Trigger Stop Lock System for Playstation DualShock 4 Wireless Controllers, Black, B0797948Z6 : Video Games
R2 L2 Dual Trigger Extender Attachment Extra Longer Button Part For Sony Playstation Dualshock 4 Ps4 Pro Slim Controller Gamepad - Accessories - AliExpress
For Sony Dualshock 4 Pro Slim Controller L2 R2 Trigger Extenders For Play Station 4 Control Dual Triggers Attachment - Walmart.com
PlayStation 4 controller is getting a "back button" attachment
Amazon.com: Mcbazel Back Button Attachment with OLED Display for PS4 Controller, Programmable Button Triggers with 3.5MM Audio Jack, Gaming Stuff Accessories for PS4 Controllers - Black : Video Games
Nyko Trigger Back Button PS4 Controller Attachment | Gadgetsin
Sony's Back Button Attachment is finally back in stock, so here's our review | Ars Technica
R2 L2 Trigger Extenders For Playstation PS4 Pro Slim Controller Dual Triggers Attachments For Dualshock 4 PS4 Controller From Kings1018, $3.52 | DHgate.Com
PS4 Best Custom Controller Accessories Xcaliber Dual Adjustable Triggers New | eBay
Amazon.com: eXtremeRate Clicky Hair Trigger Kit for PS4 CUH ZCT2 Controller Shoulder Buttons, Custom Flashshot Trigger Stop Flex Cable for PS4 Slim Pro Controller JDM-040/050/055 : Video Games