Your best bet is to go to a dealership, and quiz the parts guys on it.
The parts catalog will indicate which keys are applicable. From memory, the GTIs had the larger flip-out key with remote.
You can order them pre-cut from VW to suit your car, according to your VIN number. Then, when they turn up from Singapore around two weeks later, arrange for the service department to program them for you. They're around $400 each.
Wrecking: '97 Golf 3 CL 1.8L - still have motor, panels, and electrics!
DSG Servicing - $260, complete mobile service.