Help ID this Weatherstripping

I need to replace all the weatherstripping at a clients home. The windows are all casement style with a Kerf holding this stripping in. The windows are 25-30 years old.

In the photo the bottom edge measures 1/2 inch. This edge site against the window frame, The bottom right corner to the upper right corner fits into the kerf on the sash. This measures 1/4 inch. notice the angel of the kerf. This creates an overall width of 5/8 of an inch.

Please advice as to your thoughts