When you buy an Agent 47 suspension, you receive what we consider to be the optimal initial setup in the way of spring rate. However, everyone has their individual comfort zone and driving style, and may prefer slightly lower or higher strength springs. For this reason we offer you a variety of additional spring choices for the front and rear suspension, when using our high performance A47 double a-arm in the front, our new Fox Extreme Performance rear suspension, or the state of the art S197 coilover rear suspension. NOTE- Strut style springs for stock suspension available upon request.