Trying to find out Manufacturer of my vinyl windows

I found my pivot bar housing and pivot bar on your website. Not sure if it needs replacement, ours fell out of the bottom of the window when we last opened it. Now the window will not pivot until we replace it. Wondering how to do this, or who to contact to do it for us. Our pivot bar and housing does not look damaged. Your product number is 26-379. Do you know what manufacturer used this model of pivot assembly? I think the windows were installed in 1990s, by previous homeowner.

Thanks! Naomi

Thanks for the info. There is a sticker on the bottom of the lower dash, but time has erased all letters on it. I will be ordering the replacement hardware and hopefully that will solve the problem. Thanks.