93 cobra springs

a few months ago i bought some used bbk springs off of a 94 gt.mind you my car is a 90 vert,but the springs have proven to be way to harsh and to low.they are coming off and being sold.my question is does anyone know the spring rates,type,or close relation to a 93 cobr spring?my friend has a stock 93 cobra and it sits lower than a gt but not as low as mine now. also the ride is firm but nowhere near as harsh.
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