I need to install some carriage lights on exsisting vinyl siding. There is no box where the lights are to go. I know I could put up one of those octangular cover plates that have the stair step to the back and then drill through to the inside of the garage to get the wire through but what is the best way to do the box? I only did this once before and I used long all-thread to secure the light to the box and used a box support to attach the box, but there must be a better way. Any ideas?