38mm Marzocchi lower crown & stem for bevel 750/860/900 - this is a good used part. Possibly for center axle 750GT? Approx 46mm offset between stem and fork tube centers.
This is the actual part you are buying. You get the locknut and top nut as well as the used headset bearings you see in the photos. No idea if the bearings are any good or not.