One goal enough for Concord in semi-final.
The game started at a frenetic tempo, with both sides trying to establish the upper hand in the early moments.
However, Rangers had the clearer cut chances after the interval and substitute Gary Ogilvie's superb strike ten minutes into the second half was enough to separate the two teams.
The U's named a younger side than on the original date and probably had the better of it in the first half as they dominated possession in the opening 45 minutes.
Colchester United bowed out of the Essex Senior Cup at the semi-final stage on Thursday night as one goal was enough for Concord Rangers to progress to the final against Braintree Town.
Concord had the first half chance of the game, James White finding space inside the box, but his shot was blocked behind for a corner.
And it was from a set piece that the U’s had their first half sights of goal, as from a corner first Gilbey and then Kent almost got on the end of crosses.
That was followed by Wright jink past the full back and a low shot that tested Butler low to his left, as the game started to hit its stride.
Chances were at a relative premium as the U’s patient play in possession was counteracted by some organised defending from the home team.
O’Donoghue did get past Gordon down the U’s left as half time approached, but the onrushing Wright at the far post couldn’t connect cleanly with his header.
After a first half that saw the U’s dominate possession but be denied by strong Concord defending, the home side started the second half the stronger.
They were playing higher up the pitch and pressing the U’s, but the next chance was to fall to the visitors.
Simmons gave the ball to Gilbey and, although it half got away from him, he struck in a shot that needed blocking as it looked destined for the bottom corner.
The Beachboys got themselves in front ten minutes into the second half as they broke from lost U’s possession to reach the edge of the box.
The ball came to substitute Ogilvie, who powered home a fizzing shot that gave Cousins no chance as it rocketed home.
The U’s made their first change as Wright completed an hour and was replaced by Mason Spence.
Sanderson went into the book for stopping a Concord counter attack, as the home side started to turn the screw after their goal.
Stokes spun one just wide of the upright after a clever turn, whilst King put his header past the post after rising highest at a set piece.
The U's were prompting and probing without really getting through to Butler in the Concord goal, and the Conference South saw out the remaining minutes to progress to the final.
Cawley then drove one just wide of the post, as Concord sought the second.