window locking sash is not closing

Hello,

We do not carry an exact match for your sash lock but it does remind me of the 90-313, depending on how the dimensions below compare to yours. The throw is a hook style rather than a flat plate but it can work for similar applications. 

Dimensions for 90-313

Unfortunately, we have no way of knowing the exact projection needed for your application if the part in your photo is not long enough. It's possible that someone may have replaced the original with the incorrect lock at some point. 

Another possibility is that another broken piece of hardware such as balances or tilt latches is causing the window to be out of square and preventing the lock from reaching the sash. I would recommend looking over the window and any other identical windows in the house the determine if there are any discrepancies or broken parts.