Dan0, are you talking length which a normal Key would be about 5 1/2" 'long'. or "width"? I was talking "width". The PA80's keys are 'wider' than Yamaha's Keys are, ie. approx. 2 millimeters wider. From looking a the Pa1X's pics it looks like they reverted back to a smaller Key 'width' size for the Pa1X/Pro.

Best regards,
Mike