Need two different kinds of kerf strips for my window

Thanks for reaching out to us. I'm very confident we can help replace the weatherstripping on your window.

Now, in a lot of windows, the weatherstripping that goes on the bottom is going to be a little different than the weatherstripping that goes on the sides. However, you also have windows where the weatherstripping is the same all the way around. 

I'm not sure what your situation is, but since one seal is hollow bubble and the other is foam-filled, I'm wondering if maybe someone replaced one or the other with a new type. Sort of a mix-and-match kind of deal.

I suppose in the end it doesn't really matter as long as both types have been working equally well all this time. Out of everything in our inventory, I think our 58-053 looks closest to the foam-filled seal and our 58-055 looks closest to the hollow bubble. Those are my recommendations based solely on your photos. You might want to go over our dimensions just to be sure.

You'll note that our 58-053 is also hollow bubble, but that doesn't really matter too much. Foam and bubble both do their job equally well.

Y'know what, I've been thinking about this since I responded a few minutes ago. I think our 58-170B might be a good option for the foam-filled seal, as well. The shape is a little closer, after all, though my only concern is that our 58-170B might be a little too big. You should review our dimensions for this one, as well.