Looking for this window lock

Thanks for writing in! Your IWC Sash Lock is no long made, however, the original manufacturer does recommend using the 90-313 as a substitute. You will need to remount the holes at the top of the frame to install this and you'll need to use a screw like our 33-011. 

Be careful not to use too long of a screw. Also, when drilling into the frame, you'll want to be cautious not to drill too deep as you could damage the frame or the glass in the sash.

Dimensions for 90-313