Remote mounted oil filter housing off of a Wisconsin MTHD, the military version of the THD. Should work on any other Wisconsin 2 or 4 cylinder engine. There is a patch of rusted metal on the inside of the housing, and a smaller one on the inside of the lid. These are shown in the pictures. I wouldn’t hesitate to clean this up good and use it, but you might, which is why I’m pointing it out. Takes a Fram C21P, or equivalent, oil filter.