Window mechanism

I have a lot of old style windows (jealousie) from the late 1970s that have their mechanisms broken.

I am trying to find something that will help me repair them, otherwise I cannot open them.
Some flap in the wind as they are not closing tight all the wayPlease see the picture.
I am not sure of the size, I will have to do some more reseaach.
These are for windows that were ibatalles in the 70s in Florida.
Not sure of the company name either.
Please advise.