Dekoni Elite Sheepskin replacement earpads for the Sennheiser HD6XX Series
GEEKRIA Fabric Headband Pad Compatible with Sennheiser HD600, HD580, HD650, HD660 S Headphone Replacement Headband/Headband Pillow/Replacement Pad Repair Parts (Black) : Amazon.nl: Electronics & Photo
Dekoni Audio Elite Hybrid Earpads for Sennheiser HD600 Series | Sweetwater
Thick Foam Ear Pads Cushion For Sennheiser HD 580 HD 600 HD 650 Headphones | eBay