You guys need to get this for your MB4 asap. Because the stock plastic ones on your MB4 will be scrapped when it rubs against the ground due when the suspension compress to ground level or when it pull wheelie causing the stock plastic hinge to rub with the ground. Slowly it will expose the main lower rear suspension, the constant scrapping with the ground will weaken the lower rear suspension holder and the breaks apart. So you need to get "Alloy Rear Hinge Pin Mount Cover" and replace the stock plastic ones before you have serious problem. This stuff saves my MB4.