vinyl window fixups
Hello,
Starting at the beginning, the channel balance stamps you've referenced indicate the spring strength required to support the weight of the sash but, unfortunately, are not part numbers. We would need to see a photo of one of your balances removed from the window to identify the series. Also, the (26 3) stamps you mentioned are the same spring strengths. The difference in the rest of the stamp is nothing to worry about and is just manufacturer information.
It also sounds like you're looking for take out clips like our 16-002. Take a look and see how they compare to your originals.
If the glass is not held tightly in place, you may need replacement glazing beads. You can view our selection here. We would need to see a side profile piece of your glazing removed from the sash to narrow down your options.
Also, you can view our selection of wool pile here. To determine which, if any, of these that you could use you'll need to compare the width of the backing and height of the pile to our selection.
Lastly, we do not carry any kind of window film to cut down on UV light.