I have here is a Dye ULE back. There are no marks on the outside just where the twist lock is inside the grooves. I dont know the size sorry. Im asking 55 shipped ConUsa
http://i1101.photobucket.com/albums/...0131746-00.jpg
http://i1101.photobucket.com/albums/...0131745-00.jpg
http://i1101.photobucket.com/albums/...0131745-01.jpg