Casio WK-6600 keyboard (76key) key replacement

I have a Casio WK-6600 keyboard (76 key) that has a broken E key on the second octave, going left to right, it is the 8th key over. I’m looking for the correct part number to order for replacement. Thank you for your time and consideration.
Regards,
Justen

It looks like you replace them in a group: