1972 sliding glass door broken handle lock

Hi,

Sliders were installed in 1972 (brand unknown.) They work perfectly, have never leaked, the frame is larger than today's "standard" sizes, but the lock on the handle is broken.

Tried a "universal" handle - the affixing plate was too short. Tried a $50 handle that had the right size affixing plate, but didn't have the locking pin - even though the packaging showed it was enclosed.

Rather than incurring the cost to replace the doors plus labor, is there a locking handle that might fit?