Hello . yes the f250 4x4 and the f350 use a larger front fender radius. many parts from your truck will fit the f350 . I very much doubt you will find NOS fenders . They are very rare. I did find one in 1999 for the restoration of my 1965 f350 though . Love my truck . Have had it for 36 years. I am pretty sure i have fenders. doors and a hood plus many other parts . If you want call me at 6096180962 Jim