I agree with the above aproach. The best way to get the holes drilled in the correct place to fit the latching mechanism to the inside it to make a cardboard template that you mark the position of the holes in the latch. you should then be able to use your template to mark where the opening slot is to be cut and the 3 holes need to be drilled.
The passenger side striker plate needs to be space about 8-10mm, I used an M8 Nut (a non-nylock)
Good luck...
Dan ~
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