Here's how the box fits into the overall car. The box I just made made will be behind the seat. The front bucket (upside down box) will be under the seat.
Here is a view that shows the eurothane bushing inside the box. It sits over the spring pin.
Still have a lot of figuring out to do. the nuts will be welded to the side of the box to make it easier to re-assemble in a finished car. Need to remeber to keep the bolts accesible when I build more of the rear bulkhead.