Okay I need some help I have a 2012 JKU Rubicon and wont to replace the control arm bracket on the axle I need the measurements of were to weld the bracket in the correct position

 

Is the axle in the vehicle? I assume you mean one side. If so then use the stock control arm to position the bracket where the opposite side is. If you have a digital level then compare the mounted one and set the same vertical angle for the new one. If you are replacing both then I would suggest a similar procedure but do one at a time. And mark with a center punch on the axle tube the edge of the existing bracket to get the east-west measurement for the new bracket.