If these 1.5 coil springs are used to level the vehicle will shims be needed in the rear between the differential and leaf springs?

• what is the uncompressed length of these springs? fitment
• im looking into a 3.5in suspension but wanted fox shocks. will these 1 1/2 progressive coils be ok? general
• What is the spring rates? Also are they made with the same features as your rock crawler springs? general