Thinking a little outside the box here, maybe you could measure the amount of frame width and bracket width, then pull or press a similar diameter, similar shoulder width wheel stud into the hole. The shoulder on the wheel stud would center the bracket onto the frame.
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87 GN, and new toy: 1955 Chevy 3200 pickup, soon to have: 383, Cola crank, Childs/Albert 6 inch rods, Brownfield heads, 10:1 KB hypers, CompCam 284 Extreme Energy, Tilton Plate transmission realignment and built Turbo400.
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