After giving up on my search for MDR-CD6 replacement pads I ordered the MDR-CD5 pads X-2380-810-1 (box says they fit the MDR-CD5, MDR-CD7 & DR-100) from PARTSOLVER.COM. They are NOT an identical replacement: the foot print is slightly smaller, the foam is more significantly more dense and firm (therefore, less comfortable), edges are not as rounded. They are not perfect but probably the best option available.

After giving up on my search for CD-6 replacement pads I ordered the MDR CD-5 pads X-2380-810-1 (box also says they fit the DR-100 and Cd from PARTSOLVER.COM. They are NOT an identical replacement: the foot print is slightly smallers, the foam is more firm and, therefore, less compliant, edges are not as rounded. They are not perfect but probably the best option available.