The MB bushings are for comfort and allow lots of movement, then crack and allow too much but give a nice isolated ride. The Kmacs affect the ride on the street. They also sharpen up the turn in and feel of the road. Just be forewarned about the negative side.

You don't need a spring compressor. It can be done with a jack and patience. GC isn't making anything for the control arms. No bushings. Just springs, shocks bump stops, perches .... that I know of.

Les