Dekoni Audio · Aftermarket replacement
Replacement Earpads for Sennheiser HD598/599, HD620S, PC37X, PC38X
Verified as compatible with 1 headphone model.
Verified compatible headphones
Evidence
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dekoniaudio.com
Dekoni’s product page explicitly lists the Sennheiser HD598 among the headphones these pads fit, and gives dimensions A–E as 113, 89, 72, 47, and 22 mm.