ATH-M50x Velour Ear Pads

These are made specifically for the ATH-M50X's, if they don't fir, it's because you have the wrong headphones.

Ok, you've convinced me. I'll pick up a pair. The same size pads fit on both of my headphones, so I can use them for either.

No need to wait until you need the Micro Suede pads. Their comfort is vastly superior to the synthetic leather pads. (They breathe better, and the material just feels softer.) As for sound, I've found that they boost the sub-bass, give the mids a richer presence, and tame the treble a tiny bit. If you do buy a pair to test, I bet you'll end up buying another. (They're that good. That's why Amazon can't keep them in stock.)