This is the dimensions of the XT660Z 1" drop links.
At least you can see all the dimensions and type of steel.
It was done by a friend who is a mechanical engineer.
Warning: the plating caused the 12mm bolts to pass through the holes with difficulty and I had to use some rubbing compound to widen the holes to 12mm.

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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.