Ya’ may want to search the net to see if you can find the exact measurements on a handle. It’s a mighty small eye on those heads.

BTW HideyHo, mine was covered with (surface) rust also. I just hit it with the wire wheel on my bench grinder for about 5-mins. to clean it up. I couldn't even read the Craftsman logo before I laid the brush to it. I was surprised it had no pitting.