If these are the HM5 pads, as appears to be the case, they fit on just about anything and improve the comfort almost every time. I posted pictures of them on the MEE Audio Matrix2 in a reply, so figured I'd post how they fit on the Philips Fidelio X2. The stock pads are great on the X2, but itch my ear where the lobe attaches to my head. These are softer and do not itch at all. They conform to round cups quite well. Not sure if the sheepskin will do quite as good on round cups as the velour.
I know this is old but just in case someone goes looking I put on the Brainwavz ROUND PU (fake leather) on my fidelio X2s and they fit awesome. Thinking about springing for the sheepskin ones. Also can't say if the oval ones on this drop would work in the leather, I'd recommend against the oval, the round fit really well