Would be surprised if you could not obtain Division Plates from Warco, Chester, Chronos, RDG or someone like them. The handle and "fingers" should come as part of the Division Plate package.
It might be worth measuring the diameter, and across flats, sizes, to check with your prospective supplier, that the package that you buy will fit your table, rather than ordering and then finding that the handle and plates do not match.
It may be worth turning up a short pin (So that the handle can pass over it) to put in a hole behind the "fingers" so that they are not moved inadvertently during indexing.
Howard