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Offset has less to do with clearance than the design of the wheel/spokes. Your best bet is to print the brake template (stickied here: https://www.myg37.com/forums/brakes-...templates.html) and try it for yourself, or send it to whichever vendor you're planning to buy from. I had +38 wheels that cleared and +27 wheels that didn't.
That is the correct template placement, as long as the template is printed to scale
There is a little wiggle room in the template but looks like you might need a real thin spacer, like a 3mm, this should still allow you to use your OEM wheel studs.