I have a 1969 GTO Ram Air IV. I installed a new flapper door assembly for the ram air (never had the original). I don't know how to connect the upper ram air cable to the flapper door. The flapper has one round hole that appears to be where the cable would connect. I purchased a new upper cable, so I have the end of the cable and a round hole in the flapper, there must be something to connect the two?