I'm not sure about getting a free car. Just because you are disabled does not necessarily entitle you to such big-ticket items at no cost to you. I don't want to sound harsh, I understand your situation as I am also permanently disabled. I got government assistance with the purchase of my scooter; but, a car is not part of the package in Canada.
However, contact the agency nearest you that deals with persons with disabilities for correct, up-to-date information.