Thanks for the update on the XTX and the thicker bolts.

The XTZ bolt diameter is 12mm and the outside radius of the plate is 16mm (32mm diameter) which gives 10mm space between edge of hole and edge of plate.

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2014 XT660Z - Barrett pipe, DNA stage1.5, Barkbuster hand guards and handlebars, Pivot pegs, Teknik suspension, Guard-it engine protector combo, B&B rear rack, Trax topbox.