old aluminum storm window combo latch/key (rt.lower corner)

Hello, thank you for posting,

Your right hand latch is an older style that we no longer carry. Take a look at the 91-005 and the 91-004 along with the top tilt corners 95-026 and 95-027. These are a newer style which is self locking. No need to "stamp" the window frame or use a set screw to hold it in place. Just tap the frame together and the spring clip at the end locks it in place.