Sennheiser Legends - HD 540 Reference and HD 250 Linear : r/headphones
Replacement Ear Pads Cushion For HD250 HD540 HD560 HD 250 540 560 II Headphones | eBay
Super Thick Soft Memory Foam Ear Pads Cushion For Sennheiser Hd540 Hd 540 Series Headphones Perfect Quality, Not Cheap Version - Protective Sleeve - AliExpress