PGT sash balance
This looks like an S395-35 Channel Balance. That stamp option of 34-9 is from an old rating system we do not use. To know what stamp option to pick, obtain the exact weight of your window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option under the balance's product description.
For the Top Sash Guide, we need to see it out, with views from the front and side. From there we'll do our best to find the right replacement.
The rear sash is also a PGT Single Hung SH- 4000 with a 34 by 37 inch sash. There are two windows mounted side by side and each need the a sash guide; one right and one left, so a set.
Does the extra information help identify the pieces necessary?
I'm afraid not. Window sash weight can still vary quite a bit even when one knows the exact dimensions. Can you place a bathroom scale on the sill and gently lower the sash onto the scale? While not perfect, this would be better than nothing.
As far as the Top Sash Guide, some PGT windows use our 18-015 PGT Top Sash Guide--but I can by no means be certain this is what you need without seeing one out of the window.