how do i know exactly what variation my car is, as there are so many derivatives?

Usually the make and model is written on the back or sides of the vehicle.

The description and year model may also be found in the front of the service book, on the original purchase invoice, or on the statement from the financial institution where the vehicle is financed.

A great help in this regard can be found at www.um.co.za/specifications/ (to get list of specs and exact descriptions of your car, the heading there is ‘car-specs’).

You can Copy and Paste the URL in the Adress-Bar at the top to us once you have identified your specific model and variation - quite nifty, is'nt it?