A traditional locking fitch sash window fastener, operated by a simple rotating action for easy opening and closing. This is the smallest fastener that is available.

If there’s insufficient space between your existing closer and the glass pane you should be able to replace it with one of these. If the original closer is of the same type screw holes are often in the same place and only the swinging sections need to be replaced, making replacement easier than moving an existing closer.