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Amazon.com: Sony DualShock 4 Controller Back Button Attachment, 2-Pack
Textured Black Non-slip Back Housing Cover for ps4 Slim Pro Controller – eXtremeRate Retail
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PS4 PRO Modded Controller - XMOD 4 Back Buttons -Remap, Scuf, modchip – XMOD ELECTRONICS
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Trigger Back Button for PlayStation®4 – Nyko Technologies
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