I'd be talking to a machine shop. I'd want to know if the seal contact area on a shaft can be resurfaced without weakening the original temper of the steel and to recreate the original shape. I'm no machinist, but I wonder if it could be brazed or welded, then put on a lathe to re-cut. The axial reference points are probably still visible on the ends of the shaft. Makes centering the shaft for cutting match the original work. :-?