hello Al & Rich,
The Salice concertina system is, in fact ideal for this application. There is only a track on the top. At the bottom is a locator pin that engages when the doors are closed to keep the left and right sides in alignment with each other.
The track does not actually carry the weight of the doors. it only acts as a guide to move the doors silently and in concert with each other.
The weight is actually supported by the 110-degree hinges on the side much like a normal door.
One thing to consider. The top track is available in 1180mm (48”) lengths only. For an opening of 58” you would need to purchase 2 tracks and have a joint somewhere. The track is available in this size for the same reasons that we recommend standard doors to be no more than 24” wide. (Bi-fold = 4 - 12” doors). In your case you will have 4, 14.5” doors.
You are not far from being within this spec and I suspect Shaker doors would be quite light.
The components you would need are:
2 - Top tracks 1180mm each - F1GFA180
2 - Sliding blocks - F1PXAY
2 - Concertina hinges - F1C169
8 - Central bi-fold hinges - F1CXE9
8 - standard 110 degree hinges and mounting plates (4 for each door)
1 - Set locating device - F1RFAY
2 - Finger protection strip - F1SBAY
You should be OK here.
Here is a drawing giving some basic information on assembly. Additional assembly details are in the Salice master catalog.
Dennis