Hello,
Do you know who the manufacturer of the window was? Look for any stickers or brand names on the window and window hardware.
Also, what state and country are you in? Location sometimes helps in the research.
There were no identification tags anywhere to be seen, and I'm located in Warner Robins Ga. USA
We can get replacement top sash guides for you, please note they are only available in the color black. I will post again as soon as they become available.