Replacement triple track
I recently moved into an older home. The windows are double hung wood, and all have storm/screen windows. These storm/screen windows are self storing, and slide up and down on a triple track rail system. In order to permit removal of the storm and screen windows themselves, the lower half of the triple-track rail can be removed. On two of the windows in the house the lower track rails are missing. Thus, when I lower the storm window in the winter, they are loose and I've been duct taping them in place. I would like to find replacements for these missing track rails, but there is no manufacturer listed on the windows.
I've been looking on the internet for replacement parts, but I've found only small hardware pieces (e.g. springs, clips, etc.), nothing as substantial as these track rails. I'd consider replacing the whole storm window systems, but they're up on the third floor, so it would be a major effort.
Anyone have any idea one where I might be able to find or identify the track rail part?