I am installing new 2 gang junction box which is for 2 dimmer switches. I remove the old shallow box so I can use an old construction blue box in its place. The problem is there is a junction box on the wall on the other side which will not allow me to use the deeper blue box. I am afraid if I purchase a shallow box I will not have the space needed in the box without cramming all the wires in it. What can I do?