before I changed the springs and struts in my car. I could not find any numbers in the manuals I have(CD and books). They only mentioned the rubber pads for the springs to get the car to factory specs but, NO specs, if I remember correctly.
In your case, I would look at the struts, rear shocks,, springs, sway bars(specially), and all the front and rear end, for that matter, for damage or signs of wear.
I had a leaky rear shock.