I agree that the shims "look like" they ought go inside, but the bottom line is the caliper has to be centered on the rotor.
My calipers are centered with no shims.
I would have left the shims out, except when I did, the two caliper attachment bolts bottomed out in the blind holes in the knuckles, so my calipers were loose with out them.
So the shims are needed not only to align the caliper on the rotor, but to provide the total "stack up" dimension.
Regards -
Rocky
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