I have a set of new, reproduction, running board mouldings for my 47 coupe and am having trouble getting them to fit correctly, or I should say, staying in the correct position once they are mounted. There is no clips or holes in the running board for any clips. The mouldings seem to just clip over the lip of the running board, top and bottom, but because of the slight curve of the running board they pop off. Anyone have any ideas about how I can secure these? Thanks.