How many is a bunch? With a better understanding of the part and dimensions, that might be able to be machined. I assume the piston rod is one piece with the crosshead but the square guide isn't so clear. Does it slide within the upper plate and two side plates with what appears to be a hole in the rear plate receiving a pin to make the bottom of the square guide pocket? And what size is the square guide? Then, the lower pin hole seems to have metal in it. Is that just a pivot pin for the drive rod? Singular? A few of those dimensions and a little clearer understanding of the part, maybe a few different photo views, would probably be enough to understand what's involved and guesstimate a cost.