I'm not sure who made this window, unfortunately. That said, seeing as how it was made in 1998, chances are that the manufacturer already changed the design and a new sash won't fit in the master window frame. Why do you want to replace it? Is the glass foggy from age? If so, call your local glass shop for a glass replacement.
It isn't apparent from the picture, but the bottom rail is rotted. Thanks anyway.
Thanks again from your patience. I don't believe we can help you find a complete new sash. You would need to contact the contractor or supplier of the window to see if it is still available. In some cases, the manufacturer changes the design and it might need what they are making now.