Weather stripping on bottom of lower sash and top of upper sash where sash meets the casement. The seal was foam filled, but in the picture the vinyl outer layer has fallen off completely. The anchor has 2 barbs on each side of it. I don't really see it in your list of products, but maybe I missed it, or perhaps there is there a substitute.
The dimensions of the stripping are:
Base kerf: 1/4" long x 3/16" thick at the kerf
Foam tube: Oval shape 5/8" x 3/8"