I'm still seeing a 34mm offset on my '14, and you definitely want to avoid stressing the cooler, which is assembled with scores of individual brazed joints between all the stacked plates.There is an offset there, however doesnt seem to be under much stress.
The 2-piece Aussie bracket set is kind of undesirable from a design standpoint, as it allows mounting stresses to be applied to the cooler. Much better would be a design with a one-piece mounting plate, with the cooler bolted to the face of the mounting plate. The one-piece plate becomes a structural member between the upper and lower engine-bay crossmembers, with the cooler just sitting on top of it.
Here are some photos showing how I found the 34mm offset. First, I clamped a hardened steel rod to the face of the lower crossmember, where the lower bracket is attached. This provided a extended reference plane for the lower crossmember.
Then, I bolted the upper bracket to the upper crossmember, and simply measured the gap between back side of the rod and the face of the upper bracket with a digital caliper.
To correct the offset, you can add cylindrical spacers between the brackets and the cooler at either the top or lower bracket, or split the difference and add spacers at both top and bottom.
The first photo shows the overall setup, with the vertical rod and the upper cooler bracket.
The second photo shows the bottom of the vertical rod clamped to the face of the lower crossmember with a 6mm bolt and fender washer.
The last photo shows the offset measurement being made.
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