Sennheiser · Official replacement (OEM)
1 pair foam discs for ear pads (HD 25)
Verified as compatible with 4 headphone models.
Evidence
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spares.sennheiser.com
The HD 25 Blue, article 509177, spare-parts listing includes “1 pair foam discs for ear pads,” article 578879, described as HD 25.
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spares.sennheiser.com
Sennheiser’s exact HD 25-SP spare-parts page lists “1 pair foam discs for ear pads,” article 578879.
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spares.sennheiser.com
Sennheiser’s HD 25 Blue parts listing identifies the same foam-disc part, article 578879.
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spares.sennheiser.com
The official HD 25-C-II spare-parts page lists “1 pair foam discs for ear pads,” identifies them as for HD 25, and gives article number 578879.