Hi Splashy, well coil springs are different in two major was, three if you include progressive springs. The overall length should be the same as your old ones at least, so your ride hight stays relatively the same. Softer springs can be achieved in two ways,. The first way is to decrease the springs material thickness (thinner spring wire) The second was is to decrease the angle from level, less angle more give. The opposite is true for stiffer springs. These are called standard springs where the windings are equal from top to bottom ( same distance between each row of windings) The progressively would springs have the windings getting tighter (closer) at one end thus giving you progressively increasing resistance as the springs are compressed. Good luck hope this helps.