Yea, you won't match original wrinkle with new wrinkle.
For a good touch up on super nice original paint covers: First, de-rust any bare metal scratches. I'd give them an overnight soak in Evaporust and a rinse in thinner or denatured alcohol (as opposed to water) to get any oil off of them and to get them rust free (the original wrinkle is tough, neither chemical will hurt it if just used as a rinse/wipe). Then give them a good wipe with clean lint free white rags until they are super clean.
Now, get a spray bomb of Rustoleum barbeque black paint. Spray some in a cup and carefully touch up small bare spots with a camels hair brush. Do it in several applications/coats until it's built up to the surrounding paint levels (this can take time and patience!). At this point you can stop and use them.......OR! You can then shoot them (complete) with a
LIGHT mist coat of Rustoleum Satin Clear Coat which will give them an even sheen and make the original black look more even and "pop".
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