Here are mine on my '54 3104.
Each rail is 3-1/4" wide. The ends are roughly the same profile as the rear fenders. Standard zinc plated carriage bolts. Stainless would be better. Side rails were not a factory option. So make them any size and configuration that you like.
I used Home Depot wood. Straightened the edges with my jointer. I filled the defects, then sanded / primed / sanded /primed / sanded / painted with rattle can paint. I actually made them TOO SMOOTH. Most people look at them and ask if thay are plastic. Moral of the story ... leave some grain pattern showing.
> Full view> Closer view> Counter-sunk nuts on carriage bolts> PVC pipe holds flag pole ... I raise the flag at every show.
- Lonnie
