Louvre backing plates for storage boxes (Twyford RG10)

I have 2 wall-mounted storage units, each of which has 12 storage bins (see photo).

Both of the mounting units have deteriorated with age such that the plastic has become brittle and are no longer usable.

However, all 24 bins are fine, so I am looking for louvre mounting plates (see photo for an example) that I can hook the bins onto.

If you have any such louvre mounting plates that you no longer want, I'd gladly put them to good use.