Ivan, if you haven't already tired this place they would sure be worth a call I think. I believe the 4125 was made by Hydra-Mac and this place is known for Hydra-Mac parts, maybe they can help. http://www.hackertsales.com/ I have an IH 4136 skid steer (4130 with Isuzu Diesel) and love it, lucky I have not needed any parts yet.