How can I replace this weather stippring for my awning windows?

My living room has 2 awning windows that have kerfs in their window frame (both sides and along the bottom edge, the top does not have a kerf). The weather stripping has been coming out of the kerfs and become damaged. The stripping has a very thin (plastic? vinyl?) flap extending out of the kerf portion of the strip. I haven't been able to find a replacement option that has a similar profile. I tried to make do with a bulb type of kerf window seal, but it was much too thick to allow the window to close, even after I cut half of the bulb away to make it thinner. The kerf looks to be about 1/4" deep and the flap extends out from the kerf about 1/2".