I discovered that the stock from which the T-905 brackets was made measured at 88.2 degrees instead of 90.0 degrees. This sucks because correcting that angle is difficult due to the thinkness of the material. The same issue was found when I fabricated the Horizontal Stabilizer Attach Brackets. In that case, I went to Metals Supermarket and bought stock that was exactly 90.0 degrees. I hope I remember to my own incoming materials QC inspection next time... before wasting time replacing or correcting avoidable mistakes. I drilled the corrected brackets in assembly with the inboard tank ribs (L+R Tanks) and the T407 reinforcement plates.