Is there a term for a trim piece that surrounds a surface mount electrical box to accomodate a flush install? I'm replacing some exterior lights by our garage, but all the lights my wife has selected are either intended for a flush mount or do not have enough space to accomodate the existing electrical box, so they leave a gap. I could make something out of plywood but would prefer a more finished product.

[![enter image description here][1]][1]


[![enter image description here][2]][2]


Update:
Ended up removing the box and attaching the lamp directly to the wall. Of course the mounting plate holes didn't line up, so I had to rivet a j-box cover to it and drill appropriate holes. Spray painted the plate for rust prevention. 

[![enter image description here][3]][3]

[![enter image description here][4]][4] 


  [1]: https://i.sstatic.net/tQIaK.jpg
  [2]: https://i.sstatic.net/WktZQ.jpg
  [3]: https://i.sstatic.net/A5Fz4.jpg
  [4]: https://i.sstatic.net/o4VDC.jpg