These replacement keys are for the Yamaha DGX-660 but will also fit the following keyboards. Be sure to select the group you need from the drop down during ordering. 

KX8
DGX-660
DGX-650
DGX-640
DGX-630
MM8
MOX8
MOXF8
MX88
P35B
P45
P85
P95
P105
P115
P125
YDP-S30
YDP-140
YDP-143
YPG-635