If you have the metal brackets that were attached to the tops and bottoms of each door, have you considered just going to your local glass shop and having them fabricated, then gluing on the brackets?
Some of the brackets on the doors I had came off. I had to re-glue the brackets back to the glass. It was a straightforward process - Attached the brackets to the Beocenter, then applied glue to the flat surfaces on the brackets. Next I attached and positioned the doors so they were level to each other. Placing the Beocenter horizontally on its back was a good idea.
It wouldn't be that much of a stretch to get the glass door replacements from your local glass shop. What do you think?