I am sorry to hear about your QuietComfort 15 ear cushions.
You will require a QuietComfort 15 cushion kit, these can be found on our website under our Headphone Accessories. If these do not appear, please reach out to your local product support team. You can reach out to your local support team via clicking this link and selecting your region, this will redirect you to our website. Please scroll to the bottom of the website and there you will find a 'Contact Us' tab, this will provide you with all the relevant contact information for your country.
The health of our customers, employees, suppliers and partners is a top priority for Bose. As we work through the impact of the coronavirus disease (COVID-19) you may experience longer waiting times than expected. We sincerely apologize for any inconvenience this may cause. Please check the Bose Support website, where you will find a number of options that may help address your need.