The plastic piece on the side

Hello,

Your tilt latch resembles either the 26-266 or 26-408 shown below. You'll need to compare an undamaged latch to the specifications below. Please note that, unfortunately, the opposite-handed version of the 26-266 is no longer available. Thanks for posting. 

Alternate image for 26-266

Side view of 26-266

Alternate image for 26-408

Alternate view of 26-408

Alternate view of 26-408