After measuring again, and being satisfied with the measurments, I drilled the holes into the aft deck. Before drilling I checked to see that there would be suffiecient edge distance and drilled. I put temp bolts in the holes checked to see that it was level with the carry through spar. I figured that was a better place to measure than the aft deck in case there was any twist in the fuselage. There was a very small twist, which took a .025 shim under the left bracket to make it perfect.
