Chasing a pair of rear shock springs between 270 and 290mm free length. In aprox 15.00 N/mm (85 lbs/in).
For those that don't know the spring rates, the aproximate dimensions ...
Wire thickness - 7.5mm
Coil outside diameter - 62mm
Number of active coils - 11 to 12
Let me know the exact dimensions and I'll do the calculations :-)