Looking for window lock

Hi there, 

It's very hard to tell what the measurements are based on these photos, but we carry two sweep locks that look similar to what you have. The first is our 90-310 with the 1/4" distance from base to bottom of the locking leg. We also carry the one used by Acorn windows, which is our 90-063W with a 3/8" distance from bottom of the base to bottom of the locking leg. 

Take a look at both of these to see which one will fit your window. Yours looks closer to the 90-063W, but see what you think and get back to us if you have any questions!