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IIRC the 42 is from bolt hole on hanger. alot of people move the hangers forward an inch and half.
When you box out the front frame horns you add the 1.5" thus allowing the hangers to be moved forward. To be sure of the frame hole location please measure your springs main leaf along its lineal length ( decarced). The hole should be approx. 2.25 to 3 " shorter, this allows for proper shackle angle. Remember to think about where your springs sit at ride hiegth ? mine still have arc so I accounted for that when setting hole location. If your springs sit flat at ride hiegth you will be at full shackle angle at ride hiegth and it is much easier to determine where hole goes. I bet it goes 1/4" behind the stock rivet hole and yes, 1.5" up frpm bottom is good, just up enough so the sleeve clears the duoble thick frame on bottom. Remember the frame is boxed there so the frame is double thick on bottom. The inside of frame should have a hole in the boxing that the sleeve will partially be in. Meaning you will not be able to weld all the way around the inside edge of sleeve cause some of it sits in the factory frame hole.
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John on the hawgs 
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