Yep you have to cut and fit in the interior piece to the filler panel also you will need to rework the panel slightly to fit the quarters.. I would suggest attaching the small interior corners to the round interior panel to keep it in place inorder get a good alignment prior to welding it to the filler. to get the shape you need on the filler panel edges, it will need dolling.. oh the corners were originally brazed so the rounded corners were covered in brass....have fun... :0