Joe, earlier AD Burbs and panels came planks. Later ones plywood. One problem with plywood is, unless you special order, lumber store pieces only come 48" wide. AD floors are slightly wider than that. I've seen where one person's solution was to buy two pieces and join them down the middle. If you cover the plywood with something else, then not a big deal as the seam will be hidden.
This only apples to AD versions. Not sure what you are working on, so this information might not apply to your vehicle.
