That one will probably work OK, positioned just aft of the original crossmember mounting points at the rear spring mounts. Be careful about boxing too much of the frame C channel, and use elliptical cutouts in both ends of the boxing plates instead of vertical joints. Stovebolt frames MUST flex a little, and trying to make them too rigid by boxing usually ends up with stress cracks everywhere. Put pieces of pipe nipple across the boxed areas to prevent collapsing the box sections with the bolts for the tubular crossmember mounting plates. We fought stress cracks in dirt track race car frames for years, but they had to be fairly rigid to maje the suspension jack bolts effective for altering handling. Street machines don't need that degree of rigidity.
Jerry
