hit 170k recently so time for some pm. While reasearc ing shocks I've come to 2 choices. When I search bilstien site and AZ for my year make and model 6500's come up as replacements. I've read about 5100's/5000 and also 906 coils. Not sure if I need new coils with no apparent sag but I'm open to it. I wouldn't mind a small height increase. This is mostly a DD with some mild trail riding. Am I reading correctly that I could do 5100's in the rear and 5000's in the front and what benefit is there to changing coils to 906's? Also recommendations for bushing kits or other suspension/ride improvements is appreciated. Thanks for your input.