You can get just lowering springs, but the stock shocks will wear out faster. Then you need to pay for installation 2 times. I highly suggest getting a full coilover, springs/dampers-shocks that are designed for each other. Then probably an Ingall rear camber/toe kit.

 

well toe kit probably isnt needed...

with mine lowered around 2inches in the rear from my Stechs the simple 2-3washers for camber, and alignement was fine by just adjusting the toe adjuster STOCK....
well i havent got mine perfect yet cause my passenger rear was frozen bushing its replaced now i just have to go back and get it done again.