Remove the air cleaner and they'll all be exposed. Four injectors, holders and seals per side. Each side will also have a straight black rubber tube along the valve cover that has outlets going into each cylinder. That's the breather hose.

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Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino