Replacement earpads for the Beyerdynamic dt770 pro

I found an old discussion about replacement earpads for the Beyerdynamic dt770 pro 250. Does anyone perhaps know where I can get an OEM set of replacement pads for this headphone? I tried eBay, Amazon etc and also sent a message to Beyerdynamic. I can find some generic replacement pads but from the old discussion on the forum, I gather that the original deal makes a big difference. Thanks