You can get repros from Tony Branda. I bought a set. The front seem to fit ok (clamped them into place) but the backs are a little harder to fit. I haven't installed them permanently yet (being a wimp about drilling holes in my fenders!).
I'm putting them on my 69 mach 1 and I think they came with them on some from the factory.
I have 2 new extra moldings still in the wrapper if you are interested. I'll have to check and see what side they are for.