there is much to be said for free stuff, but if the part doesnt fit your car, you will likely spend as much money trying to make it fit as you would to get a true axel-back that was made for your car.
You might spend 50-100 to get the right hooks welded on and the right mounting plate on the end when you can get an axelback for 150-200.
point being, dont ghetto-rig it, save your money and get the right part