Spring identification

Hi everyone. Another question for you. When I bought my 2002 4runner limited the guy gave me a set of brand new springs for the rear. The truck came with a 3" lift. After measuring it I found the rear has sagged by 1.5". I want to install the springs the guy gave me but am not sure how to identify if they are the correct size. How can I identify if the springs are correct or not?
Thanks

 

Well, pictures always help.

Two, coils generally have a spring rate listed on them.

Measure the length of the coil as well, and compare to offerings made for our vehicles.

Or just buy a set of springs that'll suit your needs; shouldn't cost you more than $180 for a pair which is crazy cheap.