Weatherstrip Piling

We are in need of weather stripping for our windows. The first picture shows a picture of the type we have. The bottom strip has a 3/16" wide strip of plastic that is pressed/slide into the channel for the window. The weather stripping has a thin plastic "fin" down the center, however I am not certain that this is required.

We also have a window latch that has broken. It appears to just slide if from the side into a channel on both sides. This outside dimensions are 2.59" long, .565" wide and a channel height of .079". The end that is inserted first has a full radius.