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The R/T and T/A grilles were painted approximately semi-flat black (including the "egg-crate" center), and Base and SE models were Argent Silver... the picture looks spot-on to me...
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That is not true. No 70 Challenger Grille "eggcrate center" ever left the factory black. Many people have painted them black incorrectly but it is not factory.
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The egg crates are anodized aluminum for all 1970 Challenger models - no paint.
Surrounds were black on R/T, R/T SE & T/A.
I think SE & Challenger base model surrounds were argent or astrotone.