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They come with 0.2 inch spacers. I ended up using washers to do the job at about half that much space. The spacers are just pieces of tubing. They are intended to go under the posts and do not allow enough room to tighten the rail down if used on top.
The reason for spacing the rail is apparent in this photo:
I keep hearing about upgrading injectors. Can someone explain to me why, cant RC "bore" out the stock injectors? That way it will be an exact fit. I'm sure only to a certain extent but, wouldnt that be cheaper? Is it more of a switch of low to high impedance/peak hold?