Dekoni Audio · Aftermarket replacement
Replacement Earpads for Sennheiser HD598/599, HD620S, PC37X, PC38X Headphones (Choice Leather, Midnight, or Jerzee variants)
Verified as compatible with 3 headphone models.
Evidence
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dekoniaudio.com
Dekoni’s product page identifies the product as replacement earpads for the listed Sennheiser headphone families and explicitly includes HD 550 in its fit list. The page describes Choice Leather, Midnight, and Jerzee variants.
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dekoniaudio.com
Dekoni’s own product page names HD620S in the product title, fit list, and compatibility section, and lists Choice Leather, Midnight, and Jerzee variants.
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dekoniaudio.com
Dekoni’s product page explicitly names PC37X in the product title and compatibility list and offers Choice Leather, Midnight, and Jerzee variants. The page reports dimensions of 113 × 89 mm among other measurements; dimensions are not used to establish fit.