GrauGeist: That's one of the photos that I came across too. Unfortunately, the series of photos it's part of, doesn't show a part number that I could see, so to verify it's an L-2. I've reached out to someone that has a large collection of sights to see if he has any info available. I've bookmarked another page that has some general dimensions, so it's a start at least. Always greatfull for any assistance.