Schindler Lifts Australia Pty Ltd - Adelaide
48 Richmond Road, Keswick, SA 5035
p: (08) 8371 1300 f: (08) 8371 2260
Try these as a starting point, cos to make and install lifts,elevators, escalators etc, they need to make custom fittings and gearings for each building, and they would have the knowledge, know how or where to go to's, to get sprockets and gears made/milled up.
Their is also a place on Torrens Rd Croydon that makes them to , but not exactly sure where, it's on the right side ( north) after Days Rd, I think, or they have closed down since.