New manufacture, these extractors work for the 1902, 1910, and 1936 models. They are machined from alloy steel, heat treated, and drawn.
These extractors are unique to the Mexican Mauser and are very difficult to find in good condition. This is a drop in part, and should not need any fitting. However, due to the variance in the Mexican produced actions, this may require minor fitting. I recommend installation by a competent gunsmith.