I did this last night for the Givi rack mount from Twisted throttle, you can download the installation instructions from them and there's a template you cut out and stick to the top of the small panels you pop out.

I actually copied the sheet that I got as the were instructions on the reverse side, checked the scale was still correct (it's on the template side) cut out, took a minute and prayed to the god of workshops before pressing center through with a soldering iron and using a 20mm step drill to do the job. Worked out rather well. Haven't found the part no's for the blue 2015 color yet so I elected to do this.

Anyways.. Pics..

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And the brackets.

Attachment 13740