Replacing Sennheiser Ear Cushions

Phone audio stores, and they should be able to help you with the parts.

Go to www.head-fi.org and ask your question. YOu will be inundated with answers and DIY options.

Thank you for the advice.

This is a year later but maybe you still need an answer. I just encountered the same problem with my HD540's. Replacement is simple: just pull the ear cushion and it will pop off the headphone. It's pressure fit holds the thin foam in place, so when you pop-off the cushion, the thin foam comes lose. You can either cut a new piece of foam or use a piece of non-sound-absorptive material like thin nylon or Cool Max (the stuff running apparel is made of). I cut some pieces from an old running shirt and it works fine...looks a heck of a lot better than the foam, too.

Good Luck!
Jim in Dallas TX