Google Adwords Tracking Code

Hello,
i need to add the Google Adwords Tracking Code to see how many buyers are coming from there.
Searching on the web i have found that i have to add this code to the page checkout.result.php but i cannot find this page (it had to be in the folder administrator/components/com_virtuemart/html but this folder doesn't exist).
Can you help me with this?

Thanks
Vito Magno

Maybe you want:

components\com_virtuemart\views\cart\tmpl\order_done.php