After buying four of the skinny, no-clip 0280155700 injectors and having three of the four leak around the o-rings, I bought four of the 0280150556 injectors from the motorman link above and have had no issues. I wasn't very comfortable with the way the -700s went in, so when they started to leak I wasn't totally surprised. The -556s seated much nicer in the lower intake and rail than the 700s and definitely feel like they're supposed to be there.