Say scrappydoo2k2, along with the above, I can get you a measurement where the hole is vertically at the hanger. Horizonal is center between the hanger.
If I remember right the rear hole is 7/10" to the "swell" on the frame rail. It's actually 1/10" further forward on the LH side on mine, these aren't perfect, heck they even missed a hanger rivet on the same side
Be interesting to see if your measurements are similar.