The missing bolt is the one that you can't remove from the head without pulling the brackets. IMO it makes install way easier, and is not really needed. For me I like the riffraff pieces because they have a recessed bolts. I know it doesn't seem like a bit deal, but with all the wiring and hoses in the valley, the less edges for it to chafe on the better.
Not to mention the o ring seal. Rtv isn't the easiest substance to work with, and the o rings really simplify everything and make for a clean and easy install.
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