Had this exact same thing happen to mine, found this kit on eBay and it worked a treat: https://www.ebay.com/itm/283974047847?hash=item421e2c1867:g:YEcAAOSwsAVcgDrW&amdata=enc%3AAQAHAAAAsMgRIEUeTqWuGvDXzP7ZbE1IeBUqkYdAoB10VxK9P8SPNBWBTNg0Org1H6TW76IOacsRtW0Dn5NNEcWREET%2FzoUJsAC%2Bf4U%2FhrRy3umBnZNqhPJf5FzcDINZx48OBv1dFU5XU%2BBq6lCTO6Tg5YmvHz%2FwtFDCYWAaDhNynHIK3czTSRa626e3IocxpKUaA3qMusHPLLjk4jyem5SPiJTNOVnn2AWVAzP82yQQSQS08dlw%7Ctkp%3ABk9SR_y-_ZzaYA. Looks like they're just 3D printed so if you have a printer you're in luck! Still a terrible design on AT's part, shame since the rest of the headphones is so great