1 x o ring and 1x pintle cap (pastic), fell past slightly open inlet manifolds when removing the fuel rail. How important is it that they are removed. The o ring is an o ring. The pintle cap is a flat plastic piece approx 5mm in diameter: I have managed to locate it with a borescope through the spark plug hole but not had much luck in removing it. Its located in such a place where I cannot see it and use a tool to remote it. I tried a rubber hose on a hoover and manged to pick it up, but then dropped it again.