I just bought an 07 Seirra 4x4 and want to lift the front a bit. It has coil overs up front and ive been researching billet spacers from Superlift and Ready lift. The question is  what is the diff between the ring being inside the coil and it being on top of the mount itself. Being able to install the ring without having to use a spring compressor and disassemble the whole coil over. I'd rather have a full six inch lift and thirty fives but its not in the budget.
Any help is greatly appreciated. Awesome site by the way.