Matanza il volto della morte

My uncle was "Mike the boy" in this movie alongside the very famous Japanese actor Ken Takakura. The movie itself is okay, but I too am trying to get my hands on a copy of this movie simply because my relative was in it. The movie was originally shot in English and then dubbed over in Japanese. Although I have the Japanese version, I am trying to get a copy of the original. The National Film and Sound archive in Australia has a copy, but Toei, the Japanese company that produced the movie is refusing to give permission to make a copy for personal use. Anyhow, any help would be greatly be appreciated. A Japanese western? Can't say that there are too many of these. Can't say there would be any reason for Japanese to be dressed as cowboys, except that someone thought that it would be fun to ride horses and shoot people.