I HIGHLY suggest you corner weight your car and get real exact numbers to work with. Then call Aldan yourself and give them the weights. Let them choose your coilovers and springs. They should be right on with the shock and within 1 group on the springs.
Without accurate weights to work with though, you will get the incorrect rated springs. Most people are underestimating the actual weights of these cars. When you sit down and weigh them exactly, you may be surprised to find out it is heavier than the manufacturer advertised.
Within the travel range of your spyder, they will only be 1 or 2 shocks for it anyway, but a variety of springs.
angela