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I ended up modifying the caliper so that the wheel would clear it by a couple of mm. Because I have 315/30 tires, they already poke out about 10mm so I didnt want any more from a spacer. I will give an update if I see any cracking or failure. Here are some pictures of the modified rear calipers:
Glad to see you found a solution that you are happy with. Are you sure you left enough room for movement of the wheel and caliper? VR
As the brake pads wear, the caliper can only move inwards giving me more distance between the wheel. The brake pads have about 5000miles on them so I am hoping that when I buy new pads, I will still have clearance.