Not sure what Ive got: 727 or 904

How can you tell the difference between a 727 or a 904 when its installed in your car. My car did not have any kick down set up when I got it, it was also missing the kick down lever on the gear box. Bloke I brought it from said that it was a 727 so I got a flexable kick down kit (Lokard ) and sourced a lever. Trouble is that the kick down lever has a 'D' shaped cutout that must slip on the spline above tha selector arm. On mine it is just a small shaft that sits above the selector arm, not sure what I've got or am I missing another part.
Any Ideas?
Monaro.