Also worth mentioning that they flex quite a bit. Since my axle is in (cuz I didn't want to leave it on the floor), I can turn the nut by hand and it will squeeze the arms by at least 1/10th of an inch, and that's just finger tight. I think you'll be fine. Plenty of tolerance.
If you think about it, when you put the rear wheel in with spacers, axle and all that, once you start turning the nut, you can actually turn it quite a bit until you really start feeling a lot of resistance, leading me to believe there's a fair amount of tolerance in that.
Since you have 12" calipers why don't you just put your spacers in the wheel and then measure the distance from the outside to outside of the spacers....assuming the prongs on the calipers are long enough to clear the hub diameter.
EDIT:...now that I think of it, put the spacers in, and lay the wheel down on a flat surface, and use the end of the calipers to measure the height. That should be thinner than the axle so it'll fit. Then measure the rear caliper bracket and add the two together.
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Last edited by sbk1198; 03-04-2017 at 09:19 PM.