SilverPRL has crafted this Pewter Plated Zamak Metal with a rounded Mezuzah case and Jerusalem Design Frame. It is large enough for a 2.8" scroll and measures 5" in length and .8" in width. It can be attached by the double-sided tape that comes with the mezuzah or using screws into the holes in the case.
See the listing on this Mezuzah Collection site for purchase of scrolls.