kyosho spring rates

[Mr X]

i have searched the forum for this but couldnt find it. i would like to use losi springs on the lazer as i already have them but i need to know what the kyosho spring numbers mean. for example #70 (kit shocks), what weight are they in terms of lbs. or some other measurement? i would like to know so i can use springs from other companies with the same or different rate.