Does anyone make a 1'x1' or a 2'x3' diffusor?

I have an odd situation where I need a diffusor ( like an RPG Skyline ) that covers a 2' x 3' area. I can't use two 2' x 2' Skylines because the wall in that area is only 40" wide.

Does anyone know of a manufacturer that makes a 1'x1' or a 2'x3' diffusor?

Thanks,
Chuck