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Greetings,
When I needed replacement stripes for my Delta motorhome, Signs and Wonders of Bismarck measured and reproduced the complicated three color factory graphics. They were very reasonable in price. I am sure they could easily make a replacement colored insert for the dodge tailgate. Their number is 1800-201-3848. Personally, I would look for someone in your area to make the strip. That way you can chose a color and the designs you want cut into it. Anyone listed under "signs" in the yellow pages that does vinyl should be able to do it. They can show you about how it will look on the computer before they cut it. The only thing I am not sure about is how one preps the aluminum surface to receive the vinyl graphic. Aluminum is usually a pain and since the vinyl will be less strong than the factory stuff, one will want it to stick as good as possible. Also, if your aluminum is scratched, you may want to buff it out with some steel wool or ???
Let me know how it works
Brennan R. Cook
Also, there used to be available the orange and white slashed barricade tape in a 4" width. I am sure someone can get it but I don't know who - a safety supply store? The cops would probably not like it anyway because people behind you would think you were a fixed object in the road.