Sash Control 1963

Thanks for posting. If you want to keep your same hardware you might just need our 82-310, which is the lock that comes with the 82-306. However, you would have to drill out the plug in your out side handle to accept the cylinder.

You could also just order the 82-306, which comes with the key cylinder and hole already drilled. Take note, however, that on either handle (yours or the 82-306), you will have to offset the handle on the outside of the door because the latch mechanism is not centered in the mortise latch. On your handle, you have two sets of holes. Maybe this will line up the key cylinder to where it needs to be.