The acuators are the part that actually moves the dive-flap, running from it to a servo inside the wing. They look like a piece of wire, and that's what they would be in 1/48... The "triangles" you refer to I think are dive-flap attachment points with the hinges..
I've been looking for pics of the dive-flaps, but haven't found much that shows just the flap itself, only parts of it..