Thanks. How did it turn out? Which thickness did you use? I see some on ebay that are 2mm, 4mm and one that is 5mm thick. Did you use the same size for both the inner foam and the under foam? Just curious which size you would recommend based on your experience. Thanks, Andrew

I have the same issue. My HD540 needs foam replacement too. How did yours turn out?

Hi my name is Andrew. I recently in the last few months, acquired a mint pair of Sennheiser HD540 Reference headphones. I will be looking to replace the foam discs very shortly if I can ever find some replacements.