Non tilt window parts

Hello, thank you for posting,

It appears you have either the Series 900 spiral balance with a 3/8" diameter tube or the Series 600 with a 5/8" diameter tube. Please confirm the measurement to choose the correct option.

The internal latch in your pictures is discontinued and no longer available, unfortunately. If you have the room, you might be better off substituting with a surface mount tilt latch, like our 26-228 and 26-229 or any of the others you think may work from our section here. These are different than the others in that they just screw on. We have a video tutorial that shows how we do this. Look it over and see what you think.