Equivalent to Beyerdynamic SKU: 928453 (Right Hand Side) and SKU: 935603 (Left Hand Side). This is just theinner part which seems to be particularly susceptible to breaking. The cover is easily replaced by unscrewing the 2 Torx T8 screws holding the inner to the outer slider cover and replacing the original after guiding the cable through the slot of the new part.
eBay