The long and short axles are designed to center the sprocket with the tracks. using anything other than what the tank came with will cause a misalignment problem at the track and sprocket. Then you would need o remount the gear boxes to re-align the two. <div> Some of the axle supports do require you to alter the hull to make them fit. Others like the black plastic ones i have seen are shaped to accomodate the shape of the hull.</div>