This cast zinc torque bar operator is recognizable by a round stud that protrudes approximtely 3/16" from the back side.  That stud keys into the window frame.  

• Overall height: 2-1/4"
• Overall width of case: 1-5/16"
• Stud diameter: 1/4"
• Stud protrudes: 3/16"
• Handle stem overal length: 3/4"
• Mounting holes: 2 spaced approximately 11/16' on center