Hi E-116-YH just got chance to measure mine, and is different. Mine would be about 13" overall and the two holes to fix to frame are 1 1/2" apart and run horizontal along the frame. when fitted the centre of the light would sit approx 9" above the bolt line and sit about 4 3/4" out from frame. Hope that makes sense, I'm now thinking maybe the Australian built cars had a locally made bracket.
Recently put ad to different site, should of been here instead. Car is Right hand drive Australian Chrysler Buckboard ute and I would like to fit a Left hand side tail light to get rid of the horrible orange, turn signal lights, someone has fitted