In Search Of...

The first thing we really need to find right away is a window to go back in the space that someone along the way took it out of to put in an ugly old air conditioner.  :)  The size of the hole is 24.5" x 14.5"  ... Just in case anyone out there has one that size or knows where we can find one?  :)

Need one that looks something like this, please.... and THANKS!