There are specific kits available for some front applications depending on what vehicle you have. If you are building a custom suspension the bags are available separately and in different heights depending on your installed height. All of the bags will work in front applications but you will need to watch their load rating if you are replacing the spring with them. if your front has a coil spring there is an assist bag that goes into the middle of the coil f that space is not taken by the shock. please provide us with vehicle information and we will be better able to help you.