I use to make brushed aluminm ones. But what you may not know is there is two different inserts. I don't remember the models, but about 15% of the cars have a rather flat insert compared to the others which is more rounded at the top and out at the bottom. I believe, but its been a long time, but I think if you don't have a radiator cap hole in your shell you have the "odd" one, which is more flat. I still have the jigs and at least one set of bars already bent, you interested in making your own?