Pharmaboy
Headphoneus Supremus
I thoroughly investigated the X2 pad "swapability" when I first got my X2 a few months ago. The only way it's gonna happen is if the old pad is torn free from the plastic "mounting frame", and the new pad is re-glued in it's place. The back of the new pad will have to be trimmed with scissors (so they match the stock pad) and/or holes trimmed in the material to accommodate the 4 mounting posts in the plastic "mounting frame".
So bottom line is that it's definitely doable, but it's not a quick and easy procedure. And certainly not suitable for pad rolling, as the plastic "mounting frame" from the stock pads have to be reused.
You may be right in all this. If so, I would never attempt it. My X2s sound so good w/stock pads, there's just no need IMHO.
What makes this so weird to me is that just a couple months ago I easily removed each of the earpads (still on its mounting frame, which readily uncoupled from the earcups) and was able to pad-roll w/a pair of maroon Brainwavz round pleathers by stretching the mounting flaps of each pad completely around the earcup's body. But today--no dice.
I'm ok with it, though. The stock sound is really good for me.