Gaz already make a set for the FRP! Jacko told me, i think he might have them on his puma, or at least was thinking of getting them. Ive got 400lbs on the front of mine, and standard puma gaz springs on the back. I cant remember what the standard spring rate is on the gaz coilovers, i think around 300lbs, but the 400lbs made a hell of a difference when i fitted them, felt a lot more planted and contrallable, but it might be because my engine and turbo setup is a bit heavier then the standard.