Restoring a 1970 supreme I have run into the problem of a rotted out packing tray and under the Dutchman panel the rust is horrible. I see that they only make a packing tray for the cutlass s model. So my question is I know that a 1970 Grand Prix uses the same rear window will a good used packing tray panel work off the Grand Prix in this cutlass? My customer is past the point of no return on this car and this is the last part needed to be welded in. Any input would be great thanks.