Here is a 12 X 40 pano that would also work. From your original photo.
Last suggestion, PROMISE. Using your frame you could do a matt to make itt fit the frame. Sort of like this example.
18X40 Frame with 12X40 Pano & Matt
(
Download)
If you want to reply, then
register here. Registration is free and your account is created instantly, so you can post right away.