Dekoni Audio · Aftermarket replacement
Dekoni Audio replacement earpads for Sennheiser HD598/599, HD620S, PC37X and PC38X headphones; Choice Leather, Midnight, or Jerzee variants
Verified as compatible with 1 headphone model.
Verified compatible headphones
Evidence
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dekoniaudio.com
Dekoni’s product page explicitly includes HD 558 in the fit list and lists Choice Leather, Midnight, and Jerzee options. It gives measurements A–E as 113, 89, 72, 47, and 22 mm; it does not label the measurement axes.