Sound Professionals/Audio Technica SP-ATH-M50x-ADAPTER - Use this adapter to connect standard 3.5mm (1/8") cables to your ATH-M50x headphones SP- ATH-M50x-ADAPTER
Amazon.com: weishan Headphone Jack Adapter Compatible with Audio-Technica ATH-M40X ATH-M50X ATH-M60X ATH-M70X, Sennheiser HD518 HD558 HD595 HD595 HD598se HD569 HD579 HD599-2.5mm to 3.5mm Plug : Electronics
Audio-Technica Headphone Adapter – Thomann United States
3.5mm Headphone Adapter Jack Plug Converter | Audio-technica M50x | M50x Jack Adapter - Protective Sleeve - Aliexpress