The Door Striker was easy to installed.
I measured about 2 9/16 from the edge to the center of the striker bolt.
About 4 inches from the top of the door to the striker bolt.
I transferred this measurement to the door jamb. Using a clamp to hold the door striker support against the back side of the jamb, I drilled a 1/8 inch hole as a pilot hole.
Then I enlarged the hold to 3/8 inch and drilled the hole in the striker support.
I used a 3/8 x 3 inch harden bolt and a short piece of 3/8 id steel tubing for the striker.
Then I drilled two 3/8 holes down and through the frame to mount the bottom of the striker support.
Later, with the door in place, I may need to enlarge the hole or slot the hole to do some fine tuning on the striker alignment.