When I got my Centerdoor body, it came with floor sills that had been re-done by a previous owner. The sills and the cross pieces, were not originals. I have the remains of the original sills in storage. The original cross pieces were gone.
I later obtained a straight frame and running gear. However, when I lifted the sill assembly onto the frame, the body mounting holes did not line up. They were approximately 1/4 inch out of alignment.
In order to remedy this, I unscrewed the cross pieces (there were three of them) from the sills and bolted the sills independently onto the frame. Each sill measured to be 2 3/4 inches from the outside of the frame rails.
At that point, I determined that the cross pieces were too long to fit in between the sills. So, I trimmed a little to make them fit inside. There is a notch cut into the middle cross piece for a rear floorboard slat to fit into. I got this as close to the center of the car as possible. Another sticking point was that the mounting hole for the metal bracket that runs from the passenger sill to the middle cross piece was in the wrong place now. So, I used a drill and forstner bit to make a new one right next to the first one, similar to the driver's side as seen above.
I don't think it really matters where they are as they will eventually be covered with carpet.
Below, we see the mounted sills and cross pieces. The notched piece for the rear spring is centered equidistant from the spring mounting bolt in the rear of the frame. You can see the notched cross piece for the floorboard support slat for the rear seating area.
Now once I start applying the side pillars and doors to the sills, we will see if everything fits. If not, it's back to the drawing board.
The metal bucket was for catching kerosene when I washed the inside of the transmission.
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