Sir Earlier I put this question but unfortunately received

Sir, Earlier I put this question but unfortunately received no response. So I am putting this question again. Since, back side of the half of the total cars in my city, I saw, is seriously affected, so I have decided to to use rear guard as well as front guard.But which materials or company make will be the best for both Dzire and SX4 to install for their front and rear guard.Whether Aluminum materials for rear guard is suitable for both? Please response particularly those who have already installed it. Response from others too are welcome.