I have some brackets I had made by Jim Bailey years ago to put wheelie bars directly on the 3" axle of a stock car. Bought a kit, and Mark Oswald put it together for me. Worked great. The bracket measure from top hole to bottom hole were what Competition Engineering suggested. They are precise as Jim had a laser cutter. They are free. Pay shipping or buy me a case of beer when I see you. Simple.
jefft@southlanddodge.com