Sennheiser · Official replacement (OEM)
Padding Set for HD/HMD 300 PRO
Verified as compatible with 2 headphone models.
Evidence
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sennheiser.com
Sennheiser’s HD 300 PRO / HD 300 PROtect guide illustrates removing the ear cushions and pressing them back on until they click.
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spares.sennheiser.com
Sennheiser identifies article no. 508544 as the “Padding Set for HD/HMD 300 PRO,” comprising ear cushions and a headband pad.
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sennheiser.com
Sennheiser’s specification identifies HD 300 PROtect as article no. 506898, corroborating the target model identity.
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spares.sennheiser.com
Sennheiser’s exact HD 300 PROtect product page identifies article no. 506898 and lists the “Padding Set for HD/HMD 300 PRO,” article no. 508544, as ear cushions and headband pad.