This cast zinc door striker works with many trailer locks. The overall size is approximately 2.5" tall and just over 1" wide. The mounting holes are 2" apart. Each one is ovaled to allow for adjustments in the jamb. The opening is a 1.25" x .75" rectangle. It is .125" thick and the leading edge is slightly tapered for a gentle strike.
It comes with two sheet metal screws, but often it is better to pop-rivet the jamb in place.