Now that I think of it the trick I used might come in handy for someone so here is what I did solve the 7mm being to long. I left the bottom bolt out of the main brace that bolts to the rotor backing plate and pushed the bottom part as far inward as it would go and tightened the top backing plate bolt down. That have just enough room to force an extension into the 7mm socket going by the shock. After I had the 7mm caliper bolt tightened down all the way I loosened the top backing plate bolt aligned it all and put the bottom bolt back in and tightened both of them. Then I tightened the top caliper bolt.

Goofy but worked.

When I was removing it all to start with I just took both backing plate bolts out and pulled caliper and the plate together.

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1997 528i
2000 323i
2001 X5 3.0 auto
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2011 535xi auto
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Aftermarket E53 Radio Install