I have 4 manual Invader downriggers for sale - 2 with 4 foot booms and 2 with 4-7.5 ft telescoping booms.
They are heavy duty and come with 4 stainless 5"X5" stainless swivel mount plates. They have a tilt up/lock feature and 3 of them have 2 rod holders - the other has one.
They came of a boat I sold and are too big for my current boat. They are in good condition and are rigged with cable. I can email pics.