I like the stock pads and don't have any problem with them, some like the ATH-WS55 pads if you can get a pair at a reasonable price, be aware that they are $6.40 a PAIR from AT US Parts so careful what you pay for them.
Others seem to like the HD25 velours, but don't even bother with the HM5 pad foolishness... I also read that the ESW9 leather pads are supposed to fit as well...
Check them out stock first then get some other pads to try if you don't like them.
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