As per design, the 303-9578 can not be made from the 303-9577. The wheel cannot be repaired if the stud holes are oversized. Refer to the attachment on the process for converting a dry brake machine into wet brakes. Please note the attachment contains part numbers for converting a 777F and different numbers will be needed for the 777D. Jim has previously put together the attached file for converting the 777F. The 777D group numbers and parts lists will be slightly different, but the same process can be used. A compare consist in TMI using the 777D group numbers will provide the same type of parts lists for what needs to be removed and installed. It will indicate that the pump needs to be changed, but all that needs to be done is the addition of the center sectio