Handle for sliding glass door

We have large sliding glass doors and one handle is damaged. I would like to replace the handle. I can't find a manufacturer on the glass doors, but the attached screen doors say 'Aluminite'. The handle says 'Made in New Zealand'. I wish I could find more.

One thing I *do* have is a work order number for a supplier used by the developer that built my house. If he has records going back 15 years I might be able to find more details from him. I'm going to try that at the same time.