It seems that one of the new impossible items to find for a regal/TR is the header panels. Luckily I have 2 standard regal headers in great shape but i need to fill the hole on one for the grand national. I have seen people in the past fill them with plastic filler but you can see the outline in the paint later on. What is the proper way to do this? I was thinking of using some filler to get it mostly filled in, tapper the edges down some and fiber glass a layer of cloth in. Any better ways?