Hi John, Yep you're going to need to change the pedistal the drive gearbox mounts on and the drive for the rear spinners in addition to the chopper components.Those parts shouldn't be hard to find used. Do you have any salvage yards close byIJ The complete chopper unit I e-mailed you earlier has been sold but can call the local yard and he will alert me if another comes in,if you want to go that direction..What crops are you wanting to use the chopper for, and have you considered the disrupters or the sharktooth grateIJ