Thanks to @riposte that i found a replacement for the default pad.
I ordered the stPad microfiber one and it fits perfectly with MSR7, overall the stPad slightly improves the sound's quality that suited for my taste (bass is reduced a bit, mid range sounds less forward and extends the treble range a bit). IMO the stPad is a better choice than the HM5 Pleather Pad despite the material of the pads is different (I tried HM5 few months ago - it is much more comfortable compared to the default one but it tarnished the sound's quality).
The shortfall I found is that Yaxi does not put their product on any website, hence you will have to contact them directly (So far I did not see any distributor outside of Japan excepts one from Indonesia).
Glad to hear that