Gently pull out the leather of the earmuffs. There is a complete plastic plate under the leather. The plastic plate and the earmuffs are integrated. There is a double-sided tape between the plastic plate and the earphone unit.
eBay
Replacement Headphones Audio Jack Earphone Jack 3 Pole DIY Headphone Plug Connector Metal 3.5mm Stereo Plug
Aliexpress UK
This item has not been tested so may not work.
eBay
Earphone Case For Airpods 4 2 3 1 Pro 2 3 Cute Sanrio Pochacco Wireless Bluetooth Headset Protective Clear Cover With Pendant
Aliexpress UK
Only applicable to for Beats Studio 3.0 wired and wireless headphones. Model: Suitable for Studio 3.0 wired and wireless headphones. Type: Replaceable headband. 1 Headband. Can not be used with other headphones.
eBay
Oneplus Bullets Wireless Z2 Neckband Earphone For 1+ Nord CE 5 4 3 13 T Ace 5 3 Pro AI Noise Cancelling Bluetooth Headaset IP55
Aliexpress UK
Beats Studio Pro – Wireless Bluetooth Noise Cancelling Headphones – Personalised Spatial Audio, USB-C Lossless Audio, Apple & Android Compatibility, Up to 40 Hours Battery Life – Navy. WHAT'S IN THE BOX: Beats Studio Pro Wireless headphones, Woven carrying case, 3.5mm audio cable, Universal USB-C charging cable, Quick Start Guide.
eBay
YYK-Q16S AI Translator Earbuds 3-In-1 Music Phone Call 144 Languages Real-Time Translation Ear buds BT 5.3 Wireless Headphones
Aliexpress UK
Job lot of 3 x Beats Studio Wireless Headsets. 1 x Studio (Black Pair). Sold strictly as faulty and for spares / parts only. 2 x Studio 3 Models.
eBay
Replacement Game Mic Boom for Logitech G433 G233 GPro GPROX Gaming Headset Mic 3.5mm 3-pole Stereo Microphone
Aliexpress UK
The Beats Studio3 Wireless Over Ear Headphones are a top-of-the-line audio device designed for studio monitoring and DJ use. With a sleek blue colour and a stylish headband design, these headphones offer a comfortable fit for extended listening sessions. Featuring wireless Bluetooth connectivity and built-in microphone. Charger is not included. These have been used but cleaned up leather has been worn off the ear cups. And there is a minor opening in the shell that does not effect use. Case not included.
eBay
Bow Frog Earbud Case for AirPods 1/2/3/4/Pro 1/2/3 Bluetooth-compatible Earphone Charging Case Cover Headphone Protective Shell
Aliexpress UK
Ear Pad Cushion Compatible For Beats by Dr Dre Studio 2.0 & 3.0 Wireless headphones only. 1 (pair) x Ear Pad Cushion Compatible For Beats by Dr Dre Studio 2.0 & 3.0 as per your order. Compatible to Beats by Dr Dre Studio 2.0 & 3.0 Wireless ONLY.
eBay
Creative and cute three-dimensional deer antler headphone protective case,suitable for AirPods 4/3/2Pro/2/3, new protective case
Aliexpress UK
The price is for each part and not for the whole set! You need to choose your headphone color & the part that is broken.
eBay
Earphone Case For Airpods 1 2 3 4 Pro 2 3 Cute Sanrio Cinnamoroll Wireless Bluetooth Headset Protective Cover With Pendant
Aliexpress UK