Steps 7 - 9: Cleco'ed the WD-01207-1 Upper Horn, WD-01208-1 Lower Horn and inboard HS-01233 Horn Attach Angle to the Spar Box Assembly. Riveted the inboard HS-01233 to the aft spar using 4 LP4-3 Rivets. Riveted the horns to the Spar Box Assembly and the horn attach angles with 12 each BSPQ-5-2 Rivets and 4 AN470AD4-6 Rivets.