The 68 or 69 AIMs do not show a pinch clamp on the radiator neck nipple for the overflow hose. All that is shown is an overflow hose already attached. I've seen black diamond "U" pinch clamps on some cars (not sure if they were original cars). Was there ever a pinch clamp holding the hose to the radiator neck nipple? If so, what color was it? Black, yellow, olive drab, or red?